Orvis Wonderline Sale - anybody use these lines?

Treat yourself to a couple new fly lines this month. If you've never used
Wonderline Advantage, they are the slickest, best-casting lines in the
world-and tests at an independent lab have proved it. Maybe you need new
floating lines for your 3-weight and 5-weight rods. Or perhaps you've always
wanted to try a Double Taper or Easy Mend taper on your favorite rod, to see
if you can get more delicacy or better mends on long, tricky casts. Perhaps
you want to add a fast-sinking Depth Charge and a Clear Tip to your striper
arsenal, for situations when your plain vanilla floating line just won't do
the job. For the month of May only, pick any two Wonderlines (any taper, any
size) for only $95 and save up to $63!
For more information, click here.

Any experience with these lines?

Chris