Been using these for a while and they're really great and super small, in fact if you're out of space you don't even need to put them in your rack since they aren't powered, just let them lay on top of the rack or wherever.
I've tried putting CV and also audio through them and it works without any problems.
They are unbuffered and very simplistic (but cheap), for 1v/Oct CV operation you might want to use a buffered mult.
All in all, a great module that does what it's supposed to do.