For all those Replacement Window questions
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The Okna 800 will render a slightly better Ufactor than the imperial LS . In my opinion the real difference is looks as WOW mentioned. The Okna 800 is a better looking window.
+1. You really can't go wrong either way, but the 800 has a slight advantage in both performance and in looks (in the eyes of most folks). The fact that it comes in cheaper sounds like a "no-brainer" to me.