And I have mixed feelings. Because it is a pain having to ensure you have a pound coin with you whenever you go shopping*. And I don't like being treated as if I'm going to steal a trolley.
On the other hand, I do remember when they first came in, and we went from never being able to find a small trolley, to suddenly there being a load of them available at all times...
*Or constantly carrying a thing which is the same shape as one. and also seems to always cost £1.
Original post on Dreamwidth - there are comments there.