I hate it, Fuji. At least for a USTA or tournament setting. We play them in our ladies weekday league...but only because the singles players are allowed to "double" up and play doubles too (3 lines of pro-set singles, followed by 4 lines of pro-set -- to 10 -- doubles).
But I hate it. Just like no-ad. Bah!
A 3.5 masquerading around with a 4.0 mask on.