I have one on my Saiga 5.45 and I love it. It's very well made and looks awesome. The only negatives I have noticed are the following:
1. It's a pain to install. Instructions are inadequate and you pretty much have to figure it out yourself.
2. Once you put it on, its really best that you avoid ever taking it off again, because its a pain to put it all back together.
3. Because of #1 and #2 above, it makes me not want to shoot my 7n6 corrosive ammo, because cleaning out the gas tube is more cumbersome when leaving the handguard on.
Other than those things, it really is a nice, solid handguard. I'm running the TWS dogleg also, and have Troy micro flip-up sights co-witnessing with my Aimpoint. Really a sweet setup, I'll try to post some pics later.
If you decide to get it, contact me for some installation tips. It will make your life easier.