This topic comes up at least once a week. All of the major makers have their fans and haters. Seems like the big difference in the kits, other than the price, is the quality of the trigger in the kit, as the pins, detents and springs are, for all intensive purposes....the same. I used a Spikes kit (on sale and free shipping from AIM, thats why I got it), a Armalite bolt release (I just like the look of it) and the trigger group was worked over by Bill Springfield. $35 Is all I'm willing to spend on a trigger, my kind of shooting has no place for a $200+ trigger, and I really don't know how much better it would feel anyway. You really can't go wrong with any of the major players, I wouldn't be surprised if they all got the parts from the same place. So, take your pick: Spikes, DD, RRA, Stag, Armalite, DPMS, High Standard, and so many more... all will do what you want, it really depends on how much you want to pay.