There are many things to consider regarding monitoring and there are many good comments. Going slightly off topic from the OP:
There is a fundamental question regarding the feel, vibe, in the room(whatever you want to call it) aspect of playing live on a stage with other musicians. Guitarists are an odd lot IMO. The fact that many guitarists are not satisfied with hearing on stage what the audience hears in FOH is curious to me. I want to hear exactly, as much as possible, what the audience hears. I don't want a guitar cab as an on stage monitor anymore. I did that intially because that's what I had. I soon realized that the guitar cab resulted in very different sound than FOH. Tweaking a rig for both results in both of those sounds being compromised. This is what drove me to use a good PA monitor on stage for guitar. This way the sound of the rig is homogenous on stage and FOH. The Kabinet is not a solution for the same reason.
I think guitarists should evolve in their thinking, hearing and technique rather than be stuck with 'old' or possibly incorrect perceptions of what sounds good. Wanting to hear something different than what the audience hears should be a big red flag that the thinking needs to be adjusted.