I just bought a new M700, ADL, in .223 a few weeks ago through gunbroker. The tag on the rifle when I took it out of the box looked like it had the new X-mark pro trigger, and I thought it must be the one with the new set screw adjustment on the trigger itself. With this trigger, the barreled action doesn't need to be taken out of the stock for adjustment (so it's said). My rifle's trigger doesn't have this feature, and I figured out my rifle has the older X-Mark trigger.
I did some net surfing and found out how to adjust this trigger, and it was very simple. There was one set screw to make the adjustment (there's actually three adjustment screws, but I only had to adjust one of them). I cleaned the locking compound from the set screw with a dental pick, and backed the allen screw out to near flush with the front of the trigger housing (faces the mag well). This adjustment gave me a trigger pull of between 3 to 3.5 lbs. I've shot this rifle (still working up a load) probably 50 times by now, and the trigger seems to be very consistent with this adjustment thus far. I'm quite happy with it, and haven't considered a Timney at all so far. Also, after making my trigger adjustment, I daubed the set screw with a good smear of blue lock-tite.
I like 700s. I have a nice, vintage 1968 ADL in '06 that shoots very well, and my gunsmith adjusted that trigger to about 2.5 lbs. and it's great. I also have a syn-stocked ADL in '06 that was built in the mid 90's that my gunsmith adjusted the trigger to around 3 lbs. and it's also a great shooter. My newest ADL, the .223, I got because I wanted an ADL during Remington's 200th anniversary. So far, I haven't had any problems with the Remington triggers, and will continue to use them on my ADLs. I'm sure a Timney would be a nice upgrade, but at this point in my game, I'll save that hundred+ bucks for something else in my shooting cabinet.
BTW, that new X-mark pro Rem trigger with the set screw on the trigger itself, and no need to dismantle the rifle to adjust, looks interesting. Hope it works out for Remington's customers.