Uh huh.

I have one of Ron Moak's packs (the Starlite), and love it. So the Lunar Duo tent is certainly in the running. One advantage it might have over the TT Double Rainbow is that the two long side walls are vertical, thus providing more interior volume (and possibly eliminating the need for the rain curtain.) The LD uses two trekking poles for support, rather than a single long arch pole.

But I have really loved my Tarptent (and sold a bunch of my friends on them). Difficult decision, might just have to order both, set them up, and start comparing.

Oh, and the biggest issue that I had with the Rainshadow was the tunnel entrance. There's not much room for gear under the vestibule without blocking the door. Part of that is my size -- I'm a big guy -- and so I think I'll like the two side entrances more.