Make sure you have the errata for Sword & Fist, that's for sure.
If you're going to play a 3.5 game, you'll prolly find that you need to tweak a lot of stuff in the splatbooks a lot. Regardless, off the top of my head, these are a few I'd watch out for:
S&F- With the errata, they're pretty much all okay, but a couple of them are poor for pcs (the red avenger has to come from the right tribe and the ghostwalker almost
has to be a loner).
DotF- Hospitaler and templar, at least, are broken (imho). I think that the divine oracle is ok- there's a 17th (? maybe 18th) level diviner/divine oracle cohort in my game, and though he's powerful, he's certainly no more powerful than the others of around his level in the group. He's great at finding stuff out, but the switch to 3.5 is gonna require a lot of tweaking for the oracle since a lot of it revolved around the scry skill (prereqs and some of the class bennies).
S&S- Actually, I find all the prcs in Song & Silence to be pretty uninspiring, with the sole exception of the thief-acrobat. The others pretty well leave me cold. They aren't well-suited to adventure in a party, or else they have ridiculous prereqs (find a cursed item and be forced to take your next ten levels in this sucky prestige class, mwahahaha)
MotW- My favorite of the splatbooks, I think it's mostly ok- but again, in need of a lot of tweaking. I'm wary of the frenzied berzerker and the forsaker, and I think the exotic weapon master is slightly broken and entirely stupid (he basically becomes super fantastic at all exotic weapons- wtf? Five levels to get focus & specialization with
all exotic weapons, and the prereqs are the ability to rage, BAB +6 and any three exotic weapon profs... first off, what does being a barbarian have to do with using lots of exotic weapons, and second of all, any 6th-level barb can qualify just by spending his feats on great weapons... [/rant]).
Hope that helps!
