Well, I for one can say that they are some of the best grips I have tried. They...

1) dont leave as much visible residue as others...though i only ever get clear ones.
2) just the right amount of grip, but a little slippery when wet.
3) the grooves look large, but I have huge hands so they are the right size.
4) shape, meh.
5) Cost? They have some of the best value in my opinion, and they come in a range of colours.

Meh...you could say they are paying me, but I love them...and I sure as hell dont think everyone uses them because they are bad...though its kind of a trend.

I also heard that some other company that makes alot of "copy" parts, has the rights to produce them too..i hope this isnt starting a full on trend to bring back the 80s (i think thats when they first came out) ... The 80s didnt appear to be the best looking era.