In reply to UKH Articles:
Notable that most of the 'toughest' Munros are quite spectacular outings, and thoroughly merit the effort required. For my part, I found the 'toughest' to be the dull plods on mountains such Fionn Bheinn above Achnasheen, Ben Klibreck, of which my sole recollection is deep bog, Carn a'Chlamain above Glen Tilt, and Beinn Bhuide, above Glen Fyne. For these, and others, the tough part was generating the motivation to spend time on them, in the full knowledge that there are far finer mountains elsewhere, offering far greater rewards for the effort.