I have so far only flown the Jazz once and in relatively light conditions but it was immediately apparent that this is one very fast wing. Even with the light conditions I was able to generate considerable speed across the slope and quickly felt confident flying very close to the ground. I was surprised by how much penetration it had for a foam wing and once trimmed out how stable it is.
Full aileron with no elevator results in a quick spiral dive and with some elevator pulled a very tight roll results. I did not have any differential dialed in and probably will not do so as the turns seem quite well co-ordinated.
The trick I found was to ensure that you fly within the envelope as too much aileron at lower speeds result in stalls.... this is definitely not a floater !! The wing section is a Joe Wurts design and is very thin which I guess is one of the reasons it is so quick and retains energy in the turns and loops so well.
There is another good review of the Jazz Extreme on the Canterbury Sailplanes site but so far the Jazz has been great fun .... can't wait to try some DS'ing !!
Flying Update 4/11/2001
With lots of hours in the air now the Jazz Extreme is proving a very good wing. It is fast and agile as long as it is flowen correctly. Although not a DS'ing expert I have managed a few circuits and it is clear that for a wing it retains it energy well on the back side of the hill and with the thin airfoil speeds up quickly ... in expert hands this would be a very good DS'ing wing ....in summary this wing is as good as any of the other big name wings !!