How does it compare to TokuMX? I am a huge fan of PostgreSQL, but in order to avoid having to rewrite an application designed for Mongo, I tried TokuMX and was pleasantly surprised by its performance.
PostgreSQL indexes are b-trees, and thus will suffer the same performance drop on insert/update/delete as all other b-tree based databases (InnoDB for example). I've been meaning to run the reported benchmark posted by EnterpriseDB myself, but haven't yet had the chance. My other concern with that benchmark is that it really doesn't cover much in the way of an interesting workload.