If you look at the weight of the products of tune I think that they make great products. As a racer I can seriously race there products without beeing worried of breaking something.
So for me there products are great. For others (maintenance, stiffness and price) it maybe isn't.
For exampel my trainingswheels are dt-swiss 240s rear/lefty front with 4.2 rims, laced with comp spokes. They keep rolling forever with no maintenance. My XC-wheels are tune rear/lefty front, FRM 315 gram rims and dt revolution spokes.
The tune wheels are almost 300 gram lighter, are great for racing not good for training.