So... I did take the L$1750 plunge and buy some Lolas! Tango breast attachments. I also bought a set of Lush breasts, the ones that can be used with Tango appliers.
They look very nice, but they're not for me. I can't make them as large as I'd like. They're shaped appropriately for being supported by one's torso, but too big and they look like they're suspended by a force field. Over and above that, at large sizes you find them transparent from behind. Of course, that is because you're seeing a portion of them that you shouldn't see, a portion that is hidden from view by your torso at smaller sizes.
I will experiment some more with them; I'd especially like to see whether anyone's made a Tango applier for a T-shirt with art or text on the front. I want to see how that works with Tango breast attachments.
In summary, though--if you are happy with the range of sizes that they support, they are a fine choice. If you, as Billy Joel sang, "go to extremes", you won't be happy with them.