We had Brock do our windows in two stages in 2002 and 2003 (half each year). Had the good fortune to get the same lead installer both years a Finnish gentleman named SAKU who I strongly recommend and requested him for installation the second year. He is very experienced and takes the time to do the little touches. I researched window standards, spacers and "Window Wise" before contacting Brock and had already decided "Northstar" was the make of window I wanted (because their spacer and seals gave you warm edge technology which carries on thru the entire glass.) Altogether we had 17 major windows replaced including 2 three pane bay windows.
Not one of these windows has ever leaked or had a problem since. Brock was not the lowest price window supplier but the window standards were there and obviously the quality at this point is clear. A friend of mine also had Brock do his windows the next year but in their budget line rather than "Northstar". He had to replace 3 of them last winter (under warranty from Brock). New windows were provided no charge he just had to pay $50 each for labour to replace them. SAKU was not involved in this installation. I would recommend Brock and Northstar based on my experience and would use them again. - not sure about the budget line but thats a quality vs cost issue everyone faces. By the way on the one minor question I had and emailed recently Mike Nolet responded in less than one hour with detailed information.