Having used your products in our previous house, it was our expectation that the installers would be as efficient & professional as they had previously been. This was in fact very much the case and we are most pleased with the result. The XP slide windows, whilst providing greater sight lines in their construction, would benefit even more if the design was slimmed down further, as is now beginning to appear in your competitors' products. I feel that this configuration will become the new market standard and I'll watch your coming product lines with added interest.