I never asked Roger but I figured the Structil LE version was to hit a price point, or an attempt to counter the ever weakening dollar to Euro exchange rate which is hovering around 1.45 today.
The Structil/Px00 combination has been used by R-Sky on the Opium, Frenezy, Hoby Sport, Frenezy Evolution, Krystal FX, Nirvana FX Sport, Nirvana FX Extend and now the base NSE version. At least those are the ones produced since I've been flying (and can remember
I've owned or flown R-Sky kites framed as such in all but the last two on the above list and I can say it's quite an effective framing option. The best of the bunch, that I've flown, is easily the KFX with the NFX and Opium not far behind. My opinion anyway.