Technically the product is excellent. Their surveyor spent 6 hours measuring for each panel to ensure a perfect fit, so the proof of the pudding will be in the eating. Our roof needs replacing as there is moisture between the layers, so I just let him do his spiel and get to the best price...
I agree the sales pitch was a pain, and unnecessary for a good product, so I told him to cut to the chase and get to the best price, as that was all that interested us.