I really enjoy my Orion 120ST.
It's the scope I use the most. This scope is a great performer on deep sky viewing.
But one of the cons is the focuser that comes with it, the stock focuser isn't quite smooth enough for easy high power focusing and you can forget about any sort of AP.
So this Christmas I got a 2" Crayford Focuser from Scopestuff.
It totally changed the life of this wonderful scope
This was a simple upgrade. All you have to do is remove the 3 screws then new focuser just dropped in.