I hated the Instead. I always made a mess retrieving it, which I found difficult. It was not as uncomfortable for me as tampons (the only tampon I ever felt comfortable using was the ob, but I still used a pad if I had a choice), but I have always been able to feel anything inserted that high. The Diva is much lower and I don't notice it at all. Also I can get it out without any spills. But of course, YMMV. That's the beautiful thing about getting to know your own body--recognizing that it's not exactly the same as anyone else's.
For the record, I haven't felt the need to trim the stem, although the stem is kind of superfluous. It's the little grips at the base of the cup that are really critical in my book.