Pret were good when they had just a handful of shops. I haven't been in one for years for the reasons stated above.As a born and bred Northerner I had to do a double take a couple of years ago when I suddenly noticed a Greggs had popped up at London Kings Cross
Pret seem to have the bigger monopoly 'down south' although I must admit I've never tried one!
Greggs breakfast offerings are still very generously filled (up North at least) in my experience, their daytime sandwiches much less so in recent times so best avoided and go for the spicy wedges.