Like a dope I bought the Trio. I am not impressed. The first thing I noticed is the rpm is much slower. The bit shank is 3/16. So 1/4 & 1/8 will not work. The collett @ this point is not interchangeable. (None Avalable) I tryed to remove it but gave up for feer of damage. I do like the guid system however. I feer I am trapped buying bitts from Dremel only. We all know what that means.