The Ellipses do look nice, but don't be fooled. The shop where I work got one of the new Pista Concepts which now come with that wheelset. The cog spacing on the rear wheel needs a chainline of about 46.5mm. Not too much problem if you're using the outer ring on some road cranks, but most track crankset/BB combos put the chainline around 42. So Mavic has made this slick, new, track specific wheelset that can't accomodate a track chainline.

I called Mavic, 'cause with their reputation, I figured they had a really good reason which somehow escaped me. Nope. They couldn't give me any reason for this discrepancy.

...and isn't Ellipse a really bad name for something that's supposed to be perfectly round?