Atlas is so solid. I run both a harris style and a atlas (on different guns) the harris is much lighter but its also not nearly as solid. Also the atlas has quick release, it has adjustable tension, it has spiked feet, its similar but beefier. I use harris style on my hunting rifles where weight is a concern.
KRG makes some nice stuff, I am a big fan of they whiskey, but I have yet to actually shoot one.