Whats your opinion about those two machines people?

I mainly wanna buy one because of the cartridge system.
As i heard with a half ear, the spirit would be best for soft shading - B&G.
And the thunder would be best for lining.
dont know if its true?
Also heard that they run best with cheyennes own pow,supply and using it with other supplys might cause problems. dont know if thats true either..
Im using a Hurricane supply, and i really like it - would hate to see it go as i also thing cheyennes pow.supply looks like crap tbh..
im on the hunt for a cartridge machine that does both lining and shading - B&G.

so whats ur 50 cents on those 2 wonderfull machines?