I just surfed in when googling on AppAssure. We're a support company in Scotland and are moving all our customers over to it. We like it because it pretty much just works. There are a couple of gotchas to avoid, but nowhere near the headache of other products - I wouldn't class BE as a competing solution - just a problem that seems to lingering like my current manflu. Any questions on AppAssure let me know.
Appassure has certainly put the ass in our apps, for sure!
(Actually, turns out that we're already one of Certum's customers, and they've mostly been OK, as far as I'm aware - I have nothing to do with the bits that they do.)
Further interactions with spammers - they dropped a Christmas gift basket of goodies (food goodies, not networking and virtual server goodies) into our office yesterday, and I've just had a cake from it for my breakfast (hey, it's Christmas!). It was a big Black Forest French Fancy thing, and very nice it was too.
Therefore, I totally endorse this product or service.