I've had owned three Montanas' in total, currently have two. Two were good, one was abysmal. Gooders are sweet and you'll want to carry nothing else. A bad one will make you crazy.
I just bought an 84m classic off the EE for parts to fix my broken down Montana in 7mm-08. Misfiring (weak primer-strikes and long in the headspace) and feeding issues plague this rifle and after a trip to a reputable gunsmith and replacement parts directly from Kimber the issues are not resolved. 84M's especially earlier serial #'s are prone to the above problems, it's not unique to mine, Kimber has QC issues. Accuracy problems are also widely reported although mine have been around MOA with load development.
Enough whining...here's my thoughts on the Kimber Montana. I compare them to a highly tuned race car. They run on the ragged edge of reliability. All parts are minimized to shed ounces and the miniscule firing pin and spring sound like a rimfire when released.
The Montana is challenging to shoot accurately,they require technique. WSM's (8400 Montanas) are especially punishing during repeated bench sessions. The stocks are well designed,although ring height is critical to keep my cheekbone from slapping the stock. They balance fantastic. Full length barrels but still come out near 40" OAL.
If ultra-light gear is a must for you (and you know who you are) then the 84M can't be beat. You play the lottery. Try and stay away from used. Realize that Kimber has no warranty center in Canada AFAIK and cross you're fingers you get a gooder.
If you get a decent one, or you stay the course and iron out the problems you will be rewarded with what I feel is the finest carry-rifle in production today. Check-out prices on custom rifles that come anywhere close to the Montana in weight. NULA or Riflesinc.'s Strata come to mind. Good luck
