I wasn't as fortunate as other reviewers. The installation of my FM Industry (Clera) windows was completely botched. The windows themselves are fine, but the installation was a complete joke. The capping slopes in and water pools on the sill. Ice forms inside due to lack of insulation - no insulation on some windows or on the door frame - confirmed by third party installers and by a recent NRCan energy audit which failed a blower door test. Massive air infiltration was confirmed around all windows and the front door. Repeated efforts to rectify the poor installation have fallen on deaf ears. Very frsutrated and disappointed.
UPDATED Jan 05, 2010 – I'm into my third winter with these windows and am very disappointed with the performance. Ice forms on the inside of the windows (not water, but ice), cold air still comes in under the front door sill, and it is very uncomfortable to sit anywhere near a window. I'm truly amazed that anyone would rate these windows with top marks. I must have received a dud batch because mine are worse than the 20 year old wooden windows I replaced.