I used to own a Pajero - Montero looks to be the same wagon.
4WD on it was nice, interior was comfortable. However I found the suspension to be lacking and the engine had continuous electrical probems (V6 3500cc model), especially with the throttle controller getting dirty which let to the engine stalling on idle or overthrottling in neutral. I also found lots of niggly issues like shakes in the steering at certain speeds and poor steering lock.
I ditched the Pajero and went back to an Isuzu Bighorn (aka GMC Trooper/Honda Horizon in the US). I had owned a Bighorn before I got the Pajero. The Bighorn has a better suspension (Lotus) and more reliable engine, I also went to the diesel model - and found the diesel much more economical and reasonably powerful. Its acceleration is not is nice as a V6 petrol engine, but once cruising its actually smoother and quieter.