Definitely try before you buy if at all possible. Loaders are like women. What is great for one guy is fingernails on chalkboard for the next.I don't have a loader yet, but am keeping an eye out for an older machine that's not completely worn out. Right now there's a Bobcat 2410 mini-loader for $18, a Cat 904b mini-loader for $40, and a '76 920 Cat for $19. The 2410 Bobcat is too small. I can do as much (or more) with my vintage 720. The 904 Cat is probably hy-stat ?! It's out of my price range any way. The 920 would be OK, (the smaller 910 would be even better), but very few of either here in Alaska, and the few that do pop up every once in a while are all pipeline era machines with a ton of hours and worn out center joints and loader arm joints. I'm patient, there's no hurry. Something may come along. Definitely will NOT buy a loader that is hy-stat though.
I have a baling customer that tried a CAT mini loader (908?) and sent it down the road fairly soon as being underpowered. He traded it for a Hyundai 730 or 740, a small full size loader.
As far as I know all the compact loaders are hydrostatic drive.
My target size would be in the 20-22,000 lb machine weight. I've driven the L90E and F Volvos and they get a bit ponderous as they are pretty heavy for their size.