I am a big fan of the one on my buddies rifle. He hauls it for the hike in and out and I just borrow it and slap it on my rifle when its my turn to shoot.
I like the stoney point ones. They make model (I can't remember what it is called) that clips in and out of a small female piece you attach to your front swivel stud. The reason I like them is that you aren't stuck with a bipod on your gun all of the time.
Harris 9-13, swivel, smooth legs....
Had an Atlas. I absolutely hate it, and have traded it to my gunsmith for some work.
Wish I would've known about that! I've had the pleasure of using an atlas a few times and have nothing but good things to say about them. The ability to move/swing and pre-load it really is what sets it apart in my mind.