S
SRE
and please don't pump the best, most knowledgeable installer for information then shaft him for another installer who is a bit cheaper but who you had to give all the knowledge gleaned from the slightly more expensive but knowledgeable installer. It takes a long time to keep up with changes in the market place and to learn how to install properly, that's why they are a bit more expensive but are also more likely to be there if you need after sales service in years to come because their business model is sustainable.
