I had not tried three-network CMI before, so I picked up three discounted VPS plans during the 618 sale and ran some tests. 
📄 Product Configuration
| Plan |
🇭🇰 RFCHost HKG-Premium-Mini |
🇭🇰 ISIF HKG-Bs-CM |
🇭🇰 FxTransit VIA |
| Location |
Hong Kong, China |
Hong Kong, China |
Hong Kong, China |
| Hardware |
1vCPU, 1GB RAM, 15 GB SSD |
1vCPU, 768MB RAM, 20 GB SSD |
1vCPU, 768MB RAM, 20 GB SSD |
| Traffic |
1500GB (in+out) |
2000GB (in+out) |
2000GB (in+out) |
| Rate |
1000Mbps |
1000Mbps |
Mainland China 500Mbps / international 10Gbps |
| Route |
three-network CMI return routes |
three-network CMI return routes |
three-network CMI return routes |
| Network |
1 x IPv4 |
1 x IPv4 + 1 x /48 IPv6 |
1 x IPv4 |
| Price |
monthly USD$ 5.67 |
monthly EUR€ 6.00 |
first month USD$ 1.00 / from the next month USD$ 12.00 / yearly USD$ 115.20 |
💻 Basic Information
| 🇭🇰 RFCHost |
🇭🇰 ISIF |
🇭🇰 FxTransit |
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🎬 IP Quality
| 🇭🇰 RFCHost |
🇭🇰 ISIF |
🇭🇰 FxTransit |
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🌐 Network Quality
🇭🇰 RFCHost @1000Mbps
| evening peak 20:00 |
off-peak 14:00 |
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🇭🇰 ISIF @1000Mbps
| evening peak 20:00 |
off-peak 14:00 |
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🇭🇰 FxTransit @500Mbps
| evening peak 20:00 |
off-peak 14:00 |
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📍Return RouteRoutes
single test, routes are for reference only
| Carrier |
🇭🇰 RFCHost |
🇭🇰 ISIF |
🇭🇰 FxTransit |
| China Mobile |
CMI |
CMI |
CMI |
| China Unicom |
CMI |
CMI |
CMI |
| China Telecom |
CMI |
CMI |
CMI |
China Telecom and China Unicom return routes both detour through the Shanghai entry point.
| 🇭🇰 RFCHost |
🇭🇰 ISIF |
🇭🇰 FxTransit |
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🇭🇰 RFCHost
🇭🇰 ISIF
🇭🇰 FxTransit
📡 Multi-location Pingtest(itdog.cn )
RFCMobilePacket loss was also observed on RFC Mobile during the daytime, and evening peak Mobile packet loss was also more severe than on the other two.
off-peak 14:00
| 🇭🇰 RFCHost |
🇭🇰 ISIF |
🇭🇰 FxTransit |
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evening peak 21:00
| 🇭🇰 RFCHost |
🇭🇰 ISIF |
🇭🇰 FxTransit |
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⏳full-dayTCP-PINGReturn RoutelatencyMonitoring(GlobalSign)
I made a chart; treat it as a qualitative view.
🇭🇰 RFCHost
| Region |
China Mobile |
China Unicom |
China Telecom |
| Beijing |
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| Shanghai |
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| Guangdong |
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🇭🇰 ISIF
| Region |
China Mobile |
China Unicom |
China Telecom |
| Beijing |
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| Shanghai |
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| Guangdong |
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🇭🇰 FxTransit
| Region |
China Mobile |
China Unicom |
China Telecom |
| Beijing |
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| Shanghai |
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| Guangdong |
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📤 Outbound Routes(itdog.cn )
| Carrier |
🇭🇰 RFCHost |
🇭🇰 ISIF |
🇭🇰 FxTransit |
| China Mobile |
CMIN2/CMI |
CMIN2 |
CMIN2 |
| China Unicom |
10099 |
10099 |
10099 |
| China Telecom |
CN2 |
CN2 |
CN2 |
All three VPSes use carrier-specific optimized outbound routes.
🇭🇰 RFCHost
| Region |
China Mobile |
China Unicom |
China Telecom |
| Beijing |
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| Shanghai |
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| Guangdong |
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🇭🇰 ISIF
| Region |
China Mobile |
China Unicom |
China Telecom |
| Beijing |
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| Shanghai |
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| Guangdong |
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🇭🇰 FxTransit
| Region |
China Mobile |
China Unicom |
China Telecom |
| Beijing |
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| Shanghai |
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| Guangdong |
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iPerf3 TCPsingle-threadspeed test
During evening peak, single-thread speeds back to China do not seem very different. FX, as always, has a huge international bandwidth pipe. RFC had higher retransmissions among the three, such as in international speed tests.
GuangzhouMobile TanCloud@500Mbps
| 🇭🇰 RFCHost |
🇭🇰 ISIF |
🇭🇰 FxTransit |
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BeijingUnicom9929 Kuxueyun@1Gbps
| 🇭🇰 RFCHost |
🇭🇰 ISIF |
🇭🇰 FxTransit |
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NingboTelecom Wuyuyun@500Mbps
| 🇭🇰 RFCHost |
🇭🇰 ISIF |
🇭🇰 FxTransit |
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Hong Kong DMIT T1
| 🇭🇰 RFCHost |
🇭🇰 ISIF |
🇭🇰 FxTransit |
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🗒️ Summary
The differences among the three are small. If you need this route type, keeping any one of them should be fine. Perhaps because it has more users, RFC was slightly worse on retransmissions and packet loss in this test. 
🔗 About the Tests
All machines tested in this article were purchased at my own expense; TCP tuning was limited to enabling BBR, with all other parameters left at defaults; results may be time-sensitive.; ISIFISIF’s IPv6 tests can be viewed from the links below.
🇭🇰 RFCHost HKG-Premium-Mini NodeQuality report
🇭🇰 ISIF HKG-Bs-CM NodeQuality report
🇭🇰 FxTransit VIA NodeQuality report