We’ve been using for months one of these composite video USB capture cards without big issues and we recently bought another one which also works fine. Around 15 bucks. Sometimes there’s around half a second of latency as soon as you plug it in, but you just need to unplug/replug it (or do the same via software). I’d say the quality is acceptable but I have no real reference points. We capture at 720x576, 25 FPS which matches our signal. We mostly use it with OBS on Linux. We’ve only quickly tested the S-Video connection. We haven’t tested the audio part. To plug it straight in our computer is problematic, but we still try avoiding USB extensions in our video signal path, since they gave us problems sometimes.