Paula,Terrip88* I have both the Melt full roller and the OPTP blue and aqua half roller. In my opinion they are of similar densities. Hope this is helpful.
Hi Gals! I'm sorry to say that sometimes the shipping expense is a deterrent. If you don't own any rollers, this link is to the MELTed Pilates bundle, and may give you more bang for your buck http://bit.ly/meltedpilat esbundle
The one thing to note about the OPTP rollers is that their full roller is a 6" diameter, half roller a 3" diameter. The MELT roller is 5" and half is 2.5" inches. I notice the difference less on a half, but there are a few moves: bent knee press and rib length (from my MELTed Pilates Mat) that the .5" is noticeable. Be sure to adjust or consider the cues accordingly!