Glad you like it dude. I can't say I've noticed it being any easier to overwork the skin than any other machine.
I do find the Cheyenne Needles are a little slow at packing solid colour.
if you're at all interested I have a load of ttech cartridges for sale at 80p each. A mate is getting rid of his thunder and sold me all his cartridges, but there's a few sizes I wont really use