I am very pleased with my Elite. I have a Prime model as well, but the Elite is a great balance of features vs weight and cost. The extra power helps with deeper muscles. I have the charging base, which makes it easy to have it ready to go at all times.
It really helps recovery, reduces muscle soreness, and makes warm-ups go a little faster. I think the longer stroke length, different attachments, and weird handle actually do matter. I haven't tried the app and it seems pointless, but more manual speed settings might be nice. My biggest complaint is that it's too hard to reach my back by myself. But it's great for legs, chest, and lats.