Our experience was much the same as M-Squared's. We went with Marvin, and they are fantastic.
It is difficult to say if $300/window is a 'good price.' It depends on where you are (labor costs will vary all across the country) and what kind of product you're getting. Your best bet is to get 3-5 quotes from contractors in your area offering approximately the same product (unfair to compare Pella/Marvin to the random vinyl window), and compare between them.
Also, going with the Low Bidder is not always cost effective, even though it may seem like it is. Hire & purchase based on value, not price alone. You're going to be living with these windows until you move out of the house... and if you're like me, you don't want to be living with cheap crap, cause it'll only make you mad every time you open/close/look at/feel the draft from the window.
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