I have been very impressed by the
Sporti brand. I have two pair of Jammers from them and they seem to be quality products--even down to the logo being embroidered instead of a decal. I am by no means a heavy duty swimmer, but they seem to be holding up well (I believe both of them are made of the XtraLife Lycra fabric).
To me, and maybe Jammers are a different story, but it seems the sizing is a bit bigger. I have put on weight but still 'fit into' the Jammers I had gotten when I was a little smaller. Maybe they just stretch really well (Or have stretched out)? But it seems to me, at least, that the Jammer sizing may fit a little on the loose side. The Racer Cut suits may have a different sizing method.
Here are pics of me in these Jammers:
jammers-1000w-2 by
C J, on Flickr
Sporti-Flash-Piped-Splice-Jammer-purple-right by
C J, on Flickr