Used them for an estimate only, they aren't as crazy expensive as B&Q for the fitting charge but if you make sure they know you have your own kitchen fitter/joiner to do the actual fit then they'll probably be less interested in giving you a quote. Also they will try to push you to take out finance too, that always rings alarm bells to me.
Had a Wickes kitchen fitted two years ago. The products were good but didn't use their fitters as we were having a complete kitchen refit. Used a
friend to do the fitting as he was cheap.
According to a "Which" survey, giveup, all the well-known ones are much the same.
They're all pretty good quality these days..... much better than even twenty years ago.
Just go for the style you like.