i have only shot one 2-stage trigger and i did not like it very much. it's all squishy, and then gets tight, and then fires. i'd rather have a light, crisp single stage myself, but that is only me.
i don't mind the triggers that come with the DPMS parts kits. i've got several of them and while they are not "match" grade triggers, they are fine by me for what little bit of shooting i do.