I put the Pebble steel band on my 360 and took it off after a few minutes.
My biggest concern was that the way the band connects, it is slightly inside the watch. As I looked at how the Pebble band connected, it seemed that at points the band would be putting pressure to the underside of the 360. While the casing of the 360 is steel, the underside feels plastic and I didnt want to risk putting extra pressure on that.
Getting the links out of the Pebble Steel band is a pain in the ***. Getting the bands on and off aren't a big deal but you have to make sure you hold on to the 360 pins that connect the band to the watch. The Pebble pins are screw in while the 360 are spring loaded. Lose a 360 pin and you're off to the jewelers. And it's easy to do as you need to push the spring in to place it inside the watch. One slip and that sucker will go flying. I spent two minutes on my floor in a panic.