I'm looking forward to another Sightron SIII. I currently shoot a 6x24x50 LRMD and find it completely accurate and repeatable. I'm sure the new models will be every bit as good as the turret system looks to be the same tried and true system. The current model's turrets turn a little too easy and I was told by Sightron that the new uncapped tactical turrets are much more definate and do not turn as easily. Both are good scopes. I am also going to try the MOA reticle this time around.
The Sightron also has 15 MOA per revolution where as the Vortex is only 12. I think that being 15 will be much easier to do the math when you go a complete revolution.
The LRMD reticle is pretty outstanding though and since I don't use it for holdovers it hasn't been an issue. I have used it a little for ranging with the Mildot Master and that has worked well. Here is a link for it.