I have the 153QE and adore it. Still sews as beautifully as the day it came home. Sometimes, I get new Bernina dreams and look at them, but have never found one that I like any more than this. I've no desire at all for embroidery. The only thing I would like is the BSR - but even that has downsides.
I do have a 220 that I use for travel (sewing days @ guild, retreats and vacation) that I also love. Just a bit smaller and easier to move.