I started with the 35mm glassless carrier wtih my 7700 - but when I started playing with MF, I bought the universal carrier and the glass (including the ANG) - I have to admit, I haven't looked back since. When I use the uni carrier with 35mm, I haven't found it to be too much of a hassle getting the negs in the centre. Maybe I don't command perfection...LOL!
As for dust, I haven't had too many problems, which suprises me, considering the low humidity where I live.