Here is my review of the Yo-yo Factory protostar, enjoy.
Specs: Diameter: 55.94 mm / 2.20 inches Width: 43.15 mm / 1.69 inches Gap Width: 4.43 mm / .17 inches
Response System: CBC Slim Pad Size 19mm OD
Weight: 67.0 grams
Bearing Size: Center Trac Bearing by CBC
In my opinion, this yo-yo is very good. When you throw it, it is very smooth on the end of the string, and it executes tricks very well. It spins about 2 minutes and 30 seconds. One of the down sides is when you throw it, it is fairly loud:-. Very unresponsive, executes good bind returns. For its price, this is a very good yo-yo.