The glider is a Swift. The designer of the Fox also designed the
Swift. Sadly, neither are in production any more.

Last I talked with Marganski, (quizzing him about the Swift a couple
years ago...) they were still making the Fox, but not the Swift. It's
a sad day indeed if they don't make the fox any longer either. There
is also a one-off single seat version of the Fox as well, that they
toyed with the idea of producing but hasn't come to fruition. Jerzy
Makula has used it for the last few international acro comps. Here's a
pic: http://tinyurl.com/de333e

-Paul

PS. Thanks Ben! Brilliant video indeed (now filed under 'Brilliant!'
on my glider links page...).