The MASI Speciale I have was bought in Japan and came with Sora and Tiagra, front and back, respectively.

Bought some 105 (5600) stuff from JensonUSA and took it to an LBS here and had it installed. I was going to try to do it myself but after talking to the LBS I realized he could do it in a day for not much of anything and it didn't seem to be worth my trouble and time and possible frustration. I've done a Bottom bracket, a crank and a front derailleur and fear none of those things but I've not yet changed and adjusted a rear derailleur.

Next time.

Anyway My Speciale has all 105 stuff on it now. I'd be nuts to say there's any kind of massive difference but the shifting feels cleaner to me and I think the 105 HollowTech crank is going to be sweet. I took it from 170mm to 172.5mm while I was at it.

Here she is.