Perfect cover, almost.
I read every review and double checked the measurements of this cover and my own leather armchair.  Much as I hate to cover a leather chair- I was left no choice after my new kitten tried her nails out on it.  This cover looks great, its comfy feeling.  My armchair measures 43 across the front (including arms), 16 from seat top to bottom, 27 from seat to top of the back.
I believe I got as close as possible without getting a custom made cover.  Photos show where the cover could be slightly a better fit but...my chair is protected!