This thing is pretty small, so it doesn't give you a whole lot to grab when you are trying to work a piston out. I also kept having the tool work itself out of the piston, because the machined aluminum doesn't have enough grip to hold the inside of the piston very well.
Doesn't work at all for getting out stuck pistons, but if you somewhat regularly change seals and your piston is corrosion free you can ever so slowly get them out with this tool. Just expect to keep having to reinsert and tighten it a few times through the process.
There is a small cir-clip opposite of the end you adjust with a 3mm Allen, and it fell off. I was able to use a cir-clip for a carb needle to fix the tool, but kind of disappointed since it's Motion Pro.