I just bought one. The review looks pretty good, but its about 18 months older than the LK7900 ACE and much less expensive. $132 on eBay from green-sum. I am trying to figure out whether the extra $32 is necessary for the CPL filter. The videos do look good, but its a large unit and takes a full SD Card. It seems to have all of the features of the 7900 minus the Sony CMOS Sensor, but for rail driving it seems to do just fine. I was told they are working on Apple support for the viewer and the company seems pretty responsive. I will install it, because I really don't want to ship it back to Korea. Its a good looking unit, just large. I do wish it didn't need the cPL filter, but its nice to know I can add that if needed, to adjust brightness. Again, I just got this, and had been using a GoPro Hero3 which was really a pain in the rear switching back and forth and remembering to turn it on and flip the video so it could be viewed right side up. For the money this seems pretty good. There are a few others I might have tried first had I read the Home page a few days after I placed my order. There are plenty of choices in that $120ish range, but Lukas has very good customer reviews and this has been used in Japan for a couple of years now. I'll try to upload some video this weekend.