Will Posthaven's importer retain the source of Markdown-based posts? The little bit of blogging I did using Posterous was almost all in Markdown, and when I found out that it wasn't possible to pull the original Markdown using the Posterous API I was pretty bummed out. (although in the end Pandoc did a mostly complete job converting it back) Maybe Posthaven has more access than Joe the API user? The source Markdown exists somewhere in their DB since you can go back and edit it on the site, but I couldn't find any way to get at it via the API. Frankly, if it doesn't retain it (understandable, given Posterous's API) I wouldn't call it 100% lossless.

This is one of the bigger reasons I'd be pretty wary of managed blogs again, although I guess I'm probably not the target audience for them since among the alternatives I'm thinking about is a few Emacs Lisp functions calling Org mode, which I admit is a little fringe.