I have had experience with two machines:
1. Lobster pneumatic. Total failure to throw because latex sleeve that grabs ball until pressure builds up had aged and did not work. To be fair, a now totally obsolete design. Never, ever buy one now.
2. SP Star. Initially had typical occasional ball jamming problem until I used a heat gun and reshaped lip of hopper to reduce clearance between it and the carosel. Old low pressure balls make it worse. Also had a lower spin/propulsion motor fail which SP covered under warranty.
The Star has been used 3-4 times a week since delivery in January 2011which is a lot for a personal non pro machine. Even though it had these two problems, I would recommend it and SP to anyone. Great company and great product.
If you do buy a machine, you may find yourself with newfound friends.