As an update:

I've ordered and received both the Melbourne bra (from T9) and this Tri top from TE: http://www.teamestrogen.com/products.asp?pID=8455

I've tried both on, but used neither in a ride situation (stupid bronchitis. stupid work. lazy me ...)

Anyway, here's what I can say just from trying them on and jumping around a bit to test bounce/pain.

Melbourne:

I got the size large. The outer layer is one piece; the inner layer has multiple panels such that there are breast shapes stitched into the layer. The inner layer is mesh. I got the solid color, and I have to admit I'm not thrilled by it; I'm just not a pastel person, I guess. When I pull this bra on, what I notice are several folds in the inner layer that show through the outer layer. I can fix this by tugging on the bra here and there a few times, but it's a bit weird.

Fit: when I hop around, I feel more movement than I do with any of my other bras. The only sportsbra I've ever owned that felt as "move-y" were my old cotton ones that I had for several years and wore every day =P That being said, I felt none of the pain I associate with my breasts dropping suddenly, so it must be slowing the descent enough.

Tri top:

Wow. This thing is small. As in, much less coverage than any of my sportsbras; narrower waistband, more neck showing, etc. More like a bathing suit, which I guess makes sense. I got the 36 because I wear a 36C, and while it's tight, it's not painfully so. It actually seems like it allows less movement than the Melbourne does. There are still two layers to the breast area of the bra, but without the shaping of the Melbourne. I actually suspect that I will end up liking this bra better than the Melbourne, but I'll have to put them both to the test in actual sweaty conditions to know for sure.