I have refinished 2 inexpensive guitars with Minwax wipe on poly with the oldest job now being 4 years. For what you are describing it would be fine. I however would never finish a fine guitar with it as there are so many better choices.
It's rather easy with some good prep and patience. The finish is rock hard, thin and pretty darn glossy! It will amber up a bit. After reading various posts I decided NOT to use the water based product.
I paid almost nothing for this guitar because the finish was shot! It was a great project.