My only complaint about the specialita is the portafilter holder is a little too clever in how it mounts to the machine. it both latches in and has a magnet retainer. Without going too deep into the mechanics of the problem, the end result is that the holder floats around quite a bit in the machine's slot. Here's my solution:
Luckily, it's a shiny silver solution
Oh and the sharp back side of the holder's bolt could also theoretically hit the face of the machine, so i put a little rubber sticky bumper behind it. Small design flaws, happy overall.