The single action trigger allows for a shorter pull and more consistant feel. as you pull back you find the hard spot and then boom, that is something you can train to alot quicker than a long double action pull.
a good custom gun will shoot 1/2 groups at 25 yards with match ammo all day, a lot of other guns HK, sig and some others will do that as well, but pound for pound out of the box it takes a lot to beat even factory accuarcy.
The only thing that most people dont like is the safety systems, the thumb safety takes some getting use to but its no big deal. Dont ever let anyone tell you that carrying cocked and locked is dangerous, if they say that they are dumb....the end.
Remember you are buying a military weapon designed to shoot 230 grain ball ammo, don't freak out if it wont feed semi-wads or hollow points, it's not designed to do that. Call a good smith and it can be corrected fairly cheap and you will be able to feed what ever you want (almost).
A good reil- job is always a plus and can go a long way for the money. The biggest question I get asked is, why do they need so much work out of the box, again you are converting a military weapon to a civilan defense gun, in my six years in corp I never once carried hollow points.
ergo, it was designed to be used by small hands, med, and big hands, had to work for any g.i. out of the box. Now with the aftermarket on these guns you can make one fit your hand like a glove.
Buy good magazines, again buy good magazines, even 4k customs will fail with **** mag's.
Good Luck,
A