The GXP bottom bracket has Gutter Seal Technology to keep the elements at bay and increase the life of the steel sealed bearings. Along with that, the forged alloy cups have a fresh new design.
Quiet and smooth....at least when new. I only get about 1 season of riding out of this BB but at the price it has been listed I just replace it every year.
This BB works just fine, but has a relatively limited life. I'm on my third one in just less than two years. Now I know why they are so inexpensive. If you understand this going into it, it's not so bad, just be prepared. The problem is with the sealed bearings on the drive side, which feel like rocks when you turn the bearing with your fingers. It's a good product, but has a limited life.