I think Mongo is well suited to pure PaaS. Worrying about whether the hardware or software is similar is about the same as worrying about the details of hardwar

I think Mongo is well suited to pure PaaS. Worrying about whether the hardware or software is similar is about the same as worrying about the details of hardware or software. If the needs are very specific, hosting it on a pure PaaS shouldn't be used, but more of an IaaS type of solution. I think most mLab users rely heavily on mLab's expertise, so if they trust them now it makes sense to trust them after being acquired by a company that's demonstrated interest the type of product they're providing.