used the one in Nottingham 3 times, about 3 years ago, like @kev b, had problems with the door code, every time we've not been able to get into the room with code they gave, wasted 15 minutes on the phone trying to get it reset and the equipment has never been what they promised, I had to use a keyboard amp, the last time we used it I took my own amp head.
But others have used it and said it's ok, so maybe we were just unlucky, it is cheap though, get discount when you first use it so get each member of the band to book it and you get multiple discounts