At least Champion did not try to advertise it as a 'high impact' bra like it does some of it's other bras.  This one is fine for the stationary bike and that's about it.  Anything with a modicum of up-and-down movement would require "double bagging".  That said though it is very comfortable and nice as a work (if you are not worrying about a uni-boob appearance) or sleep bra.

It is not quite seamless--there's a seam at the top of the shoulder and around the edges, but they are not bothersome and the bra itself is pretty well made.

I bought the 'purple rain/hurricane space dye' color which looks like little linked purple circles on a lighter purple/purple stripey background.  The inside is all purple and it's on the bluer end of the purple spectrum.  Fun indeed, though I don't wear these in an overly visible way.  If you are an A/B you might get away with it as an outer (no impact) garment but C or higher would probably just look tacky without some kind of coverup.

All in all it rates a 4, as it's really not much of a sport's bra per se.  It's nice, just not 'sport' quality.

JTG