I did, and it looks really cool! Probably not going to migrate either of these projects, in the short term, though. The first, because it would be a large undertaking; the other, because it does almost nothing with the database - all of one table, only a couple trivial selects, so my focus there is elsewhere for now. At some point I definitely plan to dig deeper into OpalEye, and might wind up porting one or both medium-to-long term. Though actually, if you want to scope things out and see how hard you think migration might be, that first project is Snowdrift.coop