Back to the original question: I used one of these the other night, and it was fine. I am usually on top of my amp, and my cables are in need of replacing, because I'm always standing on the damn things. So I like being untethered, no matter what. Even if I'm sat on the amp. I use no other pedals whatever except a tuner, occasionally not even that, so didn't notice latency. Our younger guitarist was also using one, and his pedalboard has its own postcode, with LOTS of effects, analogue and digital. No noticeable latency, and no crosstalk between the two.
I've ordered a gold one direct from China, £26 delivered. I'll also be having a dead Smoothhound for repairs and see if I can resuscitate it.