The search feature currently only works on Postgres. It builds an SQL sentence with an ILIKE clause, for case-insensitive matching, which I think is valid only in Postgres. It's not a huge problem for me, but I'd like having full SQLite support for when I'm in development mode.

They said they will work on a connector architecture to support other RDBMS, I hope it's not too difficult.

It looks nicer and is more easily configurable than ActiveAdmin. For simple CRUD it's probably the best admin gem I've seen. However I usually build moderately complex dashboards in ActiveAdmin (things like "show me lists with the 10 oldest open tickets and the 10 unassigned tickets with the highest priority"), and I'm not sure how would one replicate this in Administrate.