I just had a PWS (now Power home remodeling group) window installed, it is a sliding glass door, approximately 6ft long and windows of this size with any effiency rating worth mentioning tend to run 2-4k. PWS came in around the middle of that range and while the sales ptich was long winded to say the least and a bit bull headed with the method of delivery (you could not rush this guy, either you had to sit through the whole thing or throw him out) it was at least a bit informative. PWS only sells one model of windows, and they are about the highest rated efficiency windows available so you can definitely spend less, but you will also get less... We agreed on a purchase/financing and within about 6 weeks they were out to do the install. This was actually pretty cool to watch, as 3 guys (one supervising so really two guys) proceeded to efficiently rip out the old window without breaking it, cleaning up the mess as they went (they put down thier own drop cloths from the front door to the window too). They carried out the old window (sliding door so really two large panes of glass) with ease and then almost broke thier backs carrying the new window in. it was heavy as hell compared to the old one so I felt pretty good about it right then :D. They then deftly mounted it, filled the area around the frame with insulation and built an aluminum shim to cover the outside sill which was formerlly wood (they do the whole install from the outside, so they dont tear up your walls on the inside). Start to finish they did the whole thing in under 2 hours (showed up ontime too). That night a rep came back out to verify we were satisfied, answer any more questions and made another pitch to sell us some more (which we bit on cause the price was pretty good compared to what we just paid). All in all, I'm pleased with the product, installation and the company. No hidden fees (so far) and no reason to think any are coming...I expected some possible shens about increased installation cost when they came out but none of that. Finally, dont fall for the "first visit offer" where they lower the price if you commit right then, trust me any sales guy with any experience will give you that price anytime as long as you tell him its the only way you will do business.