Yes I have one on my MWS. They are great scopes but not optimal for 3 Gun. The Night Force 1x4 with the FC2 reticle would be better. If you want something flexable for close in and the farther stages look at the Elcan Specter DR 1x/4x or 1x/6x. these will allow CQB to 600 yards without to much problem on practical targets and have a huge field of view for close in. The red dot feature on 1x is bright enough for full sunlight without losing it.
The kahles 1-6 would be pretty sweet to fill a 3 gun roll. It really comes down to personal preference tho. Daniel Horner picked up the Kahles 1-6 off the prize table at the Blue Ridge 3 Gun match last month.