Can't wait to get my hands on the B10, the 1.8-10x model? That's pretty damn sweet. Plan on using it on a 20" 6.5Grendel AR. I'd like to get another to use on an M110. I have the older LR17 and ER25 I got on here for excellent deals, both with all the perks, both with GAP reticles; the ER25 is for a DTA HTI .50BMG and the LR17 currently sits on the M110 but I feel it's not only over-scoped, it's just too big for that rifle. The B17 may be okay, but the B10 will still be smaller and more appropriate, for me anyway. I thought I'd like to use it on a .338LM I plan on buying or building to shoot out to a mile or so, but now I'd rather use a larger tube, possibly a SB instead in 5-25x. I don't know yet. Depends on the .338 I guess, would be nice to not have to buy another scope but don't want to regret it and wind up doing so anyway.
Right now, my LR17 is kinda the red headed stepchild. It's damn nice, I just don't personally have much use for it to be honest and I have a lot of rifles. It's mostly the size and weight, it throws the rifles I have off. Would work better on a longer or heavier rifle I feel. Thought about calling USO to see if it would work on the M2HB okay... I figure if it will, I may dedicate it to it's tri-mount. On the HTI, the ER25 just shines. Big as shit, but boy is it nice.
The smaller erectors on the new B series will be nice and will shave an inch or so off the length making mounting much easier, but IIRC they weigh about the same and are similar to the older lineup with respect to size and weight even with the new erector. I don't care, the B10 more than makes up for it since it's the one I'll be using most and it offers pretty much everything I need at a decent price and in a package that isn't too big or too heavy.
They all have great glass and let in lots of light. GAP reticle is crisp and clear (that's the only one I have currently). Built like tanks.