I have used them. Initially wasn't interested in quote. Salesman was horrendous and just as I was escorting him out of my house his offer reduced by 75% to a very good price. I'm pleased with the product and the lads that fit them.
We had them round for a quote. It was too expensive but they sat there not leaving for 3 bloody hours. Only way we got them to go was signing up and cancelling the minute they left. I was only 18 at the time. Nowadays I would of just kicked them out.