FII is nice and clicky/smooth/bubbly. the bubbly might not make much sense unless you've actually played with it, but it's the best way i can describe the feel of it. cons is don't drop it, the faces will pop off and you'll have lots of fun picking them up and putting it back in. the FII is also really light, so if you're into that sort of thing it's a nice thing.
AV is a very clicky cube from what i remember, and before the whole dayan cube popularity explosion it was common to compare AV with FII, so they're not "that bad", but since everyone's fallen such in love with dayans they're more of an afterthought now.
the others unfortunately i can't comment on since i've never owned them, but there are also reviews of them in the hardware section if you spend the time to look.