I needed a smaller switch for a hilt I acquired. This switch fit perfectly. The blue is really a true blue color. It will not match the Blue/Blue/White Cree XP-E2 CopperNova, which is more of a cyan.
The only con I have to this switch is it's size, but it is plainly stated that it is 12 mm. If you are going for a main saber activation switch, go with the 16 mm... still, the LED is great... nice and bright, and I can't wait to use it!