| Not yet, but I just sent away for a couple sets of their Low Riding Lights. I wanted piano string design, but Roto did not have the light guage I wanted on their RS99LS set. The Low Riding Lights are 100-80-60-40, which is perfect for my Washburn, which I play baroque on. Carvin has a set of 100-40, but they are "step down" design, not true piano string.
Did you try the Concepts yet?
Paul | 
