Our windows and front door were installed by Stew and Tom - they were excellent; easy to have around; very tidy; explained the processes, what needed doing and raised any issues (along with solutions) as they arose. We were blessed with really good weather and as a result they managed to complete a 2.5 day job in two long days. The product looks great and from a security perspective we feel far more comfortable.
The only issue I have with Everest overall was a push at the outset by the salesman to apply for a finance option despite the fact we made it very clear that would not be taking up any finance. When we stopped the finance application there was a threat that our order would be cancelled - that was overcome, but an unnecessary niggle.
Anyway, we are really pleased with the end result and would recommend Everest (excluding the finance fiasco).