I posted originally under "I got hosed." I contracted to have 7 2-lite and 2 3-lite sliders replaced with Alside Excalibur. After a nightmare with pricing initially $6500 but now $5500, and scheduling (they didn't show up twice), the company installed what I thought was 9 Excalibur, Low-E Argon (Climatech) windows. I noticed immediately that the stickers on all of the windows had a u-rating of .48. Something wasn't right. I mentioned it to the installer, and after a long day we figured out that the company had "ordered the wrong windows." (they were just double paned vinyl windows, no gas no low-e).
In my estimation it was on purpose, but at any rate they re-ordered the sashes with the Climatech package and most of them were installed today (curiously one of the 3-lites was "broken" and had to be remade).
Clearly there is a difference in the Climatech windows, as the coloring of the glass is different and they seem to be warmer than the previous set. Oddly the "right" windows that were installed today have no stickers on them at all, so I can't verify the .31 U rating that I was supposed to receive. These windows look great, but now I have sashes manufactured independent of the frames that were installed for the other "wrong" windows. Also, some of the screens do not fit correctly.
Bottom Line: Excaliburs are OK, but don't pay too much for them. They seem cheap to me when I open and close them, and I have no doubt there are better windows for the money. If you ordered them, no worries, they are much better than what you had before. Be careful out there and best of luck!