I have the Magic Shine front and rear light. I cannot compare it with Bike Ray, but I can tell you that MS is an incredibly bright light and that I have been mistaken for a car (with one headlight out) several times.

You will probably hear from some detractors that the MagicShine battery was recalled, which is true, but that was awhile back and the new battery is unbelievable. I did a run-down test and it lasted for 4 hours on high beam (just the front).