I have Mingus Erectus, The Clown, Tijuana Moods, At Antibes. Antibes sounds great, the rest sound actually very good, nice bottom end, though the recordings of the pre-Columbia 50s Mingus aren't quite audiophile. But still not quite the level I come to expect compared to other audiphile label records I have.
I also have Miles Smiles, Butterfield Blues Band's East-West, and Buddy Guy & Junior Wells Play the Blues. Same verdict about those — nice sounding records but not quite as good as I hoped for.
I've heard that Transformer is an amazing pressing. Of course I've not heard many bad versions of that record, it's a great recording.