I do not currently have an optic with the MSR but have used a few in the past so here’s my take.
I loved it and as of late 2017, I had planned to base all of my following optic purchases on the MSR reticle wether it be Steiner, S&B, or Kahles. It’s a damn good reticle with only a few drawbacks that were greatly improved upon with the MSR2 which ultimately swayed me away from the MSR and delayed my optic purchases by a year.
I’ve had a pair of M7Xi 4-28x56’s and a M5Xi 5-25x56, all with the MSR2 for the last few months. In my opinion, the MSR2 is the most useable reticle for range estimation, quick engagements, and accurate follow up shots at UKD from closer ranges out to ELR/ULR distances while still providing a surprisingly unobstructed FOV. The .2 windage hash marks for the first mil left or right of center are extremely useful. The floating center dot povides an excellent aim point that draws your eye to center but never seems to be obtrusive or too fine for any target at any distance I’ve shot or glassed over, out to 3 miles. Every 10th mil down the vertical stadia below center gives you another floating dot and 3-5 mils of windage holds which I think is an excellent feature for ELR without the clutter of a tree. The vertical stadia ends 3 mils above center and provides a much less obstructive FOV while still providing a floating dot and horizontal hash for 5, 10, and 20 mil hold under. The inverted milling “L” and rapid ranging stadia provides excellent ranging capabilities. Only thing I would change is adding additional rapid ranging stadia out to 1,500 meters. Other than that small detail which is certainly not a hindrance, it’s all that I need and nothing that I don’t.
I came from using the EBR-2C across bolt rifle platforms and loved it but definitely don’t feel as if I need the tree reticle and quickly grew to really appreciate the simplicity of the MSR/MSR2 as I learned its vast capabilities. With all that being said, I would not hesitate to buy a scope with the MSR unless I had equal opportunity for the same scope with MSR2. Then I would chose MSR2, hands down.
As far as durability goes, all 3 of the Steiner M series have performed flawlessly. Bouncing around the back floorboard or the bed of my truck, day after day. Tracking and RTZ have been dead on every time. The reasons I chose Steiner M series was for their history of solid mechanical reliability, turrets, and MSR/MSR2 reticle availability.
You said you don’t care about glass quality between the three so I won’t get into that, although, you need be aware they all have excellent optical quality but all slightly different in their own ways. All 3 manufacturers are exceptional performers and I wouldn’t hesitate against S&B or Kahles however, I gravitated toward Steiner due to past experiences, features, and the inception of the M7Xi which is a huge improvement over the M5Xi in every single way. Very glad I did, I’ve been extremely pleased.