You're right, however, that was one of the reasons I upgraded too. This one can handle the full 2.5 gigs even with IDS on.
You are right about Unifi's software being pain and I love that they keep changing the UI, the controller on the server side is dependency hell, and mongodb to boot just in case you need to manage n^webscale deployments.
IDS is probably overkill for a home network anyway.
I recently replaced said router with a Dream Router 7.