Snowball,
I have the 3.5-10LRM3 on my tac. rifle,and love the thing.
The 1MOA elevation adjustments don't become a pain untill you get past 600m,and even then you can adjust your hold to compensate once you get used to it.
The best part is being able to go from a 200m Target to a 700m Target with under a full turn of the knob,and you don't have to count horizontal stadia lines on the turret,or forget where it is you are at,when breaking the rifle out of the case.
The biggest pain is the set screws that lock the cam down are prone to stripping or coming loose.There is a cure offered in the Brownells catalog,and it works,forgive me I forget the name of the maker,but they are modified set screws that bite into the aluminum turret under the cam.
I have a couple of M1's on other rifles,and dearly love them,but they don't have the versatility of the M3 in my opinion.
Definately get the Mil-Dot reticle,and get a mil-dot master while you are at it,it saves lots of time from the learning curve.
Hope this helps!
S-28