Overall DBI is a great tool. it has brought a consistency to dealing with a whole variety of different databases and the APIs that go with them.
Tried using Proxy 1.30 but gave it away in the end. It was on Digital Unix 4.0f and kept stopping responding after a couple of days. Restarting would work but this was frustrating. Not sure whether the fault was DBD::Ingres or the server but don't really care now as we have moved on.