I'll agree that the multitasking was absolutely borked on the stock ROM, but I think that's less to do with 1gb and more to do with HTCs implementation. So for unrooted users that can be a big con
At any rate, I run AOSP 95% of the time on whatever device I'm using. AOSP>sense>tw in my book.
I've also had to send my gnex and my s3 back to samsung for warranty repairs, and haven't had build quality issues with my HTCs
We didn't have LTE yet when I had the LTEvo, so I can't comment on that.