I can't speak to running a MC on the TT15, but I did own the TT15 for a few years and it was a fantastic table with overall performance that I think is above it's price tag. The supplied Virtuoso cart is very good, albeit a little noisy in the groove. I did a mod at one point and removed the stock elliptical stylus and replaced it with an AT VM95ML microline stylus. (From what I understand, the CA Virtuoso is made by Audio Technica.) It's easy to do, lots of videos and instructions out there on the web. The ML stylus gave me better tracking and a nice reduction in surface noise. I never really had a burning desire to replace the Virtuoso with a moving coil.
The key as others have pointed out is choosing a cart with the proper compliance that mates well with the Satisfy tone arm. I use the cartridge resonance evaluator tool over at vinylengine.com. At 8g effective mass, the Satisfy is a low mass tonearm, so you'll want to look at carts with higher compliance. I've read of several people having a lot of success with the AT ART9 cartridges on the TT15.