Been using a Cube since before their release last fall. Will agree in low light is does not meet any GoPro standards but seriously was impressed with the Underwater ability of the Cube going directly against the GOPro. It deals with underwater light much better than the GoPro.
I will try to do a mash up of paintball videos from the CUBE and also throw together a underwater video so folks can see.
Here is a pump practice from CFP last season before Cup. http://youtu.be/AF1Hj_46M7A
A short clip from Simon's booth at Cup http://youtu.be/Alp6LGyaQdM