Thought I'd throw my own opinion in here - We had 3 basement windows, all awkward sizes, replaced by eurotech 1.5 years ago, and we're happy with them. Their price was average (and to be honest, we chose them due to their availability to install asap at the time) but the service during installation was fast and clean and the product itself still looks and works like new. We haven't had issues post-sale, so I can't comment on after-sales service or warranty service issues.
As for glass itself, my folk's house has a large greenhouse on the front that was built over 20 years ago, and sometimes heavy loads from snow accumulation can crack the large panes of glass on the upper portion. We've had good service from M&T in Ottawa to replace them which is a pretty tricky job requiring custom size and thickness panes and awkward positioning to replace them. They aren't cheap but they've been the only company who have managed to be willing and able to get it done.
As for glass itself, my folk's house has a large greenhouse on the front that was built over 20 years ago, and sometimes heavy loads from snow accumulation can crack the large panes of glass on the upper portion. We've had good service from M&T in Ottawa to replace them which is a pretty tricky job requiring custom size and thickness panes and awkward positioning to replace them. They aren't cheap but they've been the only company who have managed to be willing and able to get it done.