i've owned the evo x set for a couple years and had some experience with the karma. the general construction of both sets seems good and i haven't had any problem with them lasting. design is also good and both sets fit quickly to various bikes. the problems i've had is mainly with the huge heavy lead acid battery i got with the evo x set. after about a year, it already discharging all it's charge between uses and it's capacity is now so small that i get only 45 min with both lights on, or about 1hr with one light. so now it's just a very good paperweight. If you like the evo x set, get the newer nicam battery which is lighter, although don't know about it's burn time. discharge would be much less of a factor also. i recently used the karma pro and was very impressed with the light weight and easy fitting. the battery fitted snugly below my stem. the beam was decent. i didn't use it for very long but i've heard that burn time is good (approx. 3hr?). I also just got the helmet kit but haven't tested it yet. I would recommend it if you're doing limited night riding and just want an uncomplicated, light and attractive set up. if you have any detailed questions, you can pm 'spandex'. if you can double the budget and take your night riding/24hr racing seriously, consider looking at a more high end set up. i just used a Night Lighting www.nightlightning.co.nz (iBlaast! i think) which was totally crazy. The battery is bigger but still comfortable to put into a race jersey pocket. I mounted it on my helmet, and didn't need any other light. It was the first time I felt as fast as riding during the day. The burn time on this puppy is rated as 6hrs...buckshot2009-01-29 06:08:22
