I’m also using the V3HD with great results.
Right now I’m editing an 8-camera worship concert shot in Latin America using Betacam SP. I have captured all footage in DVCPro50 and the image quality is excellent.
My setup is simple: MacBookPro-Intel 2.2GHz, 4GB RAM, FCP Studio2, MOTU V3HD, G-Tech 1TB G-RAID2 (FW800), Sony PVM-14M4U video monitor and a pair of Yamaha HS-50M speakers.
I’m very happy with this setup as FCP and the V3HD have been rock solid.
I have not captured any HD material as of yet, therefore cannot comment on quality/stability.
Cheers,
Marcos Sebastian