This was a business trip so my requirements were fairly basic - a good clean room, an affordable meal and a decent pint. The Watermill does the first two pretty well for the money but ought really to have a decent local brew on the bar - a minor gripe.
As others have commented, the decor is clean if a bit dated, but I don't mind that at all as it adds to the character. My chalk-board special roast pork dinner was actually excellent with nicely cooked vegetables and very good value at £7.95
Location is quite central - about five minutes walk from Paisley Canal station and for the business traveler, reasonably handy for the airport and with good parking, some of which is pay and display.
All in all, quite pleased with the value for money here and I would stay again.More