We just installed this Vertiglide this week, it's a bit unusual because it's so large.  It's a Hunter Douglas, Applause, Lifescape fabric, and I think it turned out great, have a look for yourself.This guy, all 16 feet of it, is as big as we can go on one headrail.  Let's say you have a 20 foot slider, in that case we'd have to do two individual 10 footers, one going left one right.  The Hunter Douglas Vertiglide is now the most popular treatment for the sliders.  #1 in energy efficiency and it's the only product that the stack when open practically disappears.  It has replace my beloved vertical blinds, but we still sell a lot of the verticals, just not as many. Thanks for reading.