To be honest I think most glazing companies are the same with the 'sign now' deals.
I asked Everest and a recommended local company to come and give quotes. Everest started off at 22k for 10 windows and 2 doors, then after all the 'discounts' came down too around 12k. The local company came in around 10k, but offered a buy now, pay later deal.
I told both salesman I was getting quotes from the other and it turned out they knew eachother and used to work together. You can guess what they said about eachother.
Anyway, both did the 'sign now for the best deal' routine. I told both there was no way as I wanted to think about it. Local guy didn't look like he was going to leave and tried to hang on, Everest guy said ok fine.
Local guy then continued to call me everyday for around 2 weeks. Everest guy called me back a couple of days later and offered to do the work for 10k+, last chance 'manager's deal' and open until midnight. Local guy continued to call, offered a slightly better deal (1k off I think) and that I could sign the paperwork but they wouldn't start work until I was ready or that I could cancel later. Yeah right.
In the end I was so appalled, I didn't go through with it. It wasn't like my windows were falling out anyway. Next year I may go through the process again but with different salesmen, at least now I know that if I refuse initially, they'll offer the 'deals' later on.
I was mostly annoyed by the 'this is our best price, buy now or you lose out', but then in a couple of days they'd call back and knock off a couple of grand straightaway.
/rant