Been in one once. An unremarkable experience and a visit only made because it was a convenient place for a collegue and I to stop as we were early for a meeting.
Maybe it is my age, but I really do not understand seeing people walking into where I work, with a Starbucks, Costa etc., coffee or tea in their hand. Why pay for overpriced coffee/tea, served by staff who are probably on NMW, delivered in a paper cup, when there are tea and coffee making facilities at work? And if you don't like the coffee/tea provided at work, buy your own jar and leave it at work.