I have one.. I like it for the most part. I only have two complaints.
- It is a *bit* heavy.. but it is on a very light rifle so it may seem worse than it really is. I ended up getting rid of the bulky rail covers that came with it and replaced it with light rail ladders.
- It does not line up 100% with my upper receiver rail.. but that is just me being picky (I would be surprised if any of them did).
All in all.. it is very solid and worth the money; I am not disappointed with mine.
One got-ya on install.. the front part goes OVER the guard retainer, not UNDER.