I've been using something I got from my local studio -- it's like the Wonderbat, with a heavy-duty base that takes inserts. The inserts are actually bisqued tiles that fit into the square space.
I do a lot of small stuff, so the square tile-bats work great. I pop them out of the base with an old butterknife and let them dry on a rack (air flow underneath and above helps them to dry evenly). Plus, they release as soon as they are ready to be trimmed! Since they're bisqued I don't have to worry about plaster chipping off, either.
The ONLY issue I've had is that sometimes the tolerances of the tile's manufacturing cause a bit of a wiggle. But a little slip down in the crevice fixes that easily.