I had the X2. The X3 is supposedly lighter. The rifle I had was in 270 WSM, a chambering I truly enjoy. Feeding this cartridge in the Montana X2 was not the best. I am 5'9" and the stock felt long and lean, the weight was well forward even for a short action. I read the receiver was cast. There is something that grates on me about spending 1200 for a rifle with a cast receiver.
IIRC the trigger was OK. Accuracy was on the order of 1 moa with handloads and steady aim. My Kimber cycles the 270 WSM very well by the way.
The Montana X2 stock was very high quality, even if a little open and long for me.
Verdict:
If you are a average to tall shooter looking for a good to very good rifle in a sleek or traditional chambering, who doesnt mind parting with 1300 for a cast receiver, go for it.
They seem to be good shooters, strongly built, a little heavy.
But as far as 270WSM, it must have been afterthought to them, where to Kimber it is an objective.
Wanted to add: I much prefer the feel of the safety on my Rugers, as a matter of fact, prefer a stainless synthetic Ruger M77 all the way around.