The Steelseries Rival 310 is accurate (Truemove 3), extremely comfortable and accomodates most hand sizes and grip styles. The build quality is excellent and I could not detect any problems. It just looks and feels great.
Coming in at 88.3 grams, the mouse is an excellent weight. Far lighter than the Logitech G502 and Corsair Glaive, both being over 120 grams. Sure, it might not seem that big of a deal at first. But after several hours, you feel the difference.