I have been using Nodias for a year. I got it by buying a clearance bargain at PP. I would not have bought it otherwise. But I was very happy. Compared to 999 rubbers, Nodias is faster and not so tacky. Compared to Joola Energy, Nodias is slower and much easier to control. I would say it is a replacement for speed glued rubber. I use it on both forehand and reverse penhold backhand. For an unknown, not heavily advertised rubber, it is great. I highly recommend it.