I too have been happily using iview for years, and, like you, was put off by all the EM bug rumors and general lack of support. So I was thrilled by the latest developments, and have downloaded EM2 both at work (Windows) and at home (Mac) (I had 2 iview licenses; one of the big attractions was that I could learn one program for both platforms.)
So far I've only installed it on the Windows computer, and I've been very pleased. I'm taking the opportunity to re-organize catalogs, so I am not directly moving my iview catalogs over into EM2, rather I am creating new catalogs and dropping images into them, and so far, it's all working pretty much just the way it did with iview, which is fine with me, since that's what I wanted.
Having EM2 installed on the computer changed out my old catalog icons to EM icons, which was alarming at first. However, if I try opening them in iview, they open and work just as they did before (you have to close EM2 first). I mention this because you might find it reassuring to just back up your iview catalogs and leave them untouched, in case you decide you don't like EM2. If you do open them with EM2 open, they open in EM2.
Haven't had a chance to try it on the Mac at home yet, but I'm optimistic.
Hope this helps.