The wheels seem to be great but the tires are very fragile. I also have the Mavic Ksyrium Elite UST Disc wheel set with the same fragile tires.
In less than 100 miles I have had a number of punctures in both the front and rear tires riding primarily in bike lanes on city streets. The sealant works pretty quickly most of the time but some punctures seem to re-open. All of the punctures result in sealant spraying all over the bike and my legs so you have to do a bit of cleaning up after riding.
I have looked for more durable tires but there are none fully designated as UST which means only the $70 Mavic Yksion Pro tires are guaranteed to go on easily. I have found a few tires that are supposedly UST that others have made work with some effort but I don't want to invest that much money (up to $90 each) and not be able to get the new tires on and I don't get the impression for the reviews that they are any more durable. I am hoping that someone comes out with more durable UST tires soon. Until there are more tire choices I can't recommend any of the Mavic UST tubeless wheels.