I have it and really like it. Being able to see your swing path, angles etc is very helpful. Knowing what to do with that data is the challenge though.
Rick Shiels has done a comprehensive review comparing it to a more sophisticated tracker and it's fairly accurate.
I'm using it quite often very nice piece of technology, it help me rectify my problem with swinging too far on a backswing. Good to see how fast you swing your clubs.
I got it for Christmas and have been pleased with it. The info it gives me is good and helps me work out what is happening on my bad shots. There is so much info on the full swing that it is easy to be overwhelmed with it. I've found working on getting better numbers in one or two areas when practising is enough. The putting aspect of it is a lot simpler with only a few numbers to look at, I quickly saw I was pulling a lot of my putts and this has helped me improve this aspect.
If your into understanding the technical aspects I'd recommend it.
Took the plunge, and bought it. Initial outing leaves me feeling happy with my purchase. It seems very indepth, and fairly easy to understand if you read the help notes.
First range visit with it gives me much food for thought with my swing, and hopefully will help point me in a needed direction and support my lessons.