Mine were very expensive - higher than any price I've seen here - but we're in central London and they were done by a very trusted orthodontist (did my kids braces), but totally worth it. I'm another one who had a fixed brace back in the days before permanent retainers and my teeth had moved.
At first I was a bit like, what have I done? But I got used to them really quickly. I'm on my last tray of 20 and not sure if they're going to want to do more, but I'm so happy with the changes and with how easy they've been.
There have been times when I haven't worn them as many hours as I should but when that happens I just wear that set of aligners an extra week, so it's taken me slightly longer to finish. I also like to eat every 2 hours, OP. I just take them out, eat and brush my teeth again (actually, I alternate between brushing and using Fluorigard rinse, at the orthodontist's recommendation).
The only thing is that I'd be slightly hesitant about a practitioner who is willing to do your top teeth without doing your bottom ones. First of all, your bottom teeth will be chewing into your top tray all day, and second, you could end up with a misaligned bite.
Weirdly, I feel like I'm actually going to miss them when I'm done.