I had/have issues with the slave cyl. I put in mine as well, it took me three to find one that works and about 50 miles in to it, it started making a howling noise unless I gently ride the clutch while driving. It's pissed me off enough that I bought a 4.0 and ax15 with external slave to do the swap over, just waiting for the pos to give up the ghost. Personally I see no good reason to put the slave in the bellhousing, other than to bring in more work to the dealerships when they fail..... It's amazing how little it takes to get me all fired up these days.
If it wasn't done the hard way, I didn't do it.