Very good presentation of the aesthetic differences guys. As far as being the same otherwise, I checked because I'm into specs...
They were the same (except for SPD timings) as specified by the manufacture, but in the case that I checked (RGB vs LPX), the SPD timings were (only) slightly better for the RGB.
Is it worth ponying up the (any) extra bucks based on performance? Probably not (depending on price)
Yea, essentially, you're paying for a light show.