Just came across another BC thread from 2015 where Dood was revieing the Smooth Hound and Chris from Smooth Hound said the latency of 8ms was no worse than standing 8 feet away from your cab. Here is the exact reply :-
"Well, the exact latency is 7.68ms so 8ms is a little bit conservative!
A quick point about latency, sound travels in air at around 1 foot per millisecond so adding 8ms latency is the same as standing 8 feet farther away from your amplifier. Whether you're playing bass or lead doesn't really make any difference, it's all about the attack.
I appreciate the latency figure is not the lowest around and as EBS freak says, if you need to add a lot of additional latency (eg chain a bunch of digital effects and monitor through a digital desk) you could get to the point that it is noticeable.
All the comments we've had so far on latency though have been positive. People keep saying things like "No latency" which isn't strictly true!
Here's the link to the full thread :-