Go on I'll happily take a try with the Fatboy. It is on my 'at some point' shopping list so why not?
@Satanfriendly - PM incoming. @Bob1955 - I had a Slim and the loaner Fatboy to compare. I liked the Slim because the head shape made it easier to get around the nose. The Fatboy felt slightly different in use, but it's hard to put in words. Sorry, I can't be of more help, but if you want to try the Fatboy, go for it. It's not like there's a big queue.