0 stars!
I was specifically looking for SOCKS5 proxies with real UDP support (QUIC/HHTP/3/WebRTC) and decided to test XSocks. On the same machine, with the same browsers and the same antidetect browser, other providers that advertise UDP support correctly provide working QUIC/HHTP/3/WebRTC, while XSocks consistently fails these tests and doesn't deliver the expected UDP behavior.
Even in a setup where all system TCP and UDP traffic is routed through the proxy at the network level, other SOCKS5 providers successfully pass UDP traffic, websites load over HTTP/3, and QUIC/WebRTC work as expected. When switching to XSocks in exactly the same setup, UDP traffic effectively doesn't pass: QUIC/HHTP/3/WebRTC stop working and tests hang or fail.
Meanwhile, the service advertise UDP support but, when presented with the results of independent checks and refuses to refund even a small payment, citing their terms. If you need proxies with reliable UDP support (QUIC/HHTP/3/WebRTC and other UDP-dependent use cases), I recommend avoiding XSocks and choosing a provider that can prove UDP support not just with marketing claims, but with external tests.