We registered for this blender loving it's small footprint and clean looks. Perfectly happy with having a plastic (polycarbonate) jar, since it's lighter, and offers 1-piece simplicity (stick it in the dishwasher, pull it out, done).
BUT, and this is a big but: the jar doesn't last. Our first one went after a few months of use (1-2 times a week ONLY). Even though it has an ice-crush button on it, I started pre-crushing the ice with our ice maker when we purchased our replacement jar (at $50!). The second jar didn't seem to take any longer to start cracking. The cracks seem to start around the handle, and work their way up and down. Slowly, but surely, the jar begins to leak onto your blender and the counter. And, of course, it's sticky and nasty, and annoying. I just ordered my 3rd jar and I'm grumpy about it. Another $50 to KitchenAid, in support of this failure of a product. I wish the glass jars would fit it, but sadly they don't. Your only choice is to replace with another doomed jar, or order a new blender... which I guess I'll have to do next time.
The jar is simply not going to last, even under moderate to light usage.
AVOID THIS BLENDER, and possibly any blender with a poly jar.