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Love it!
Used loopy hd this weekend at a gig with my band Supa Joint, and it worked flawlessly using the Tascam iU2 with my iPad 3. Can't wait for the next update (I want a reverse option sooo bad). Also excited about audiobus to incorporate djay and ielectribe. Anyone looking for a gently used Boss RC 50? Thanks Michael.

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Behringer XENYX 802 Mixer
Shure SM58 Vocal Mic (input 1)
Korg Kaossilator Pro (input 2)
iPhone 3Gs running iMaschine and djay (input 3 stereo)
Akai XR20 drum machine (input 4 stereo)
Main out stereo -> venue mixer
Control room out mono -> crappy onstage keyboard amp
Mixer FX mono send -> Boss ME-50 (stereo out) -> Tascam iU2 -> iPad 3 running Loopy HD
XR20 midi out -> Tascam iU2 midi in, midi out -> Kaossilator Pro
With this setup, I can effect and loop anything coming thru the onstage mixer. Next step is to get a larger mixer with two effect sends so I can tweak, distort and crush what's coming out of Loopy HD.
Possibly tied to inappropriate midi settings (me and midi got a love/hate relationship)
The iU2 works, but I'd like something better. Just too pumped to try loopy live at a gig quick, so I went with the cheapest stereo in/out with midi I could get.
Check this forum post... Slick1975 knows what's up.
http://forum.loopyapp.com/discussion/179/anyone-using-tascams-new-iu2-interface-with-loopy