Have flown the Duo Discus at California City, the Duo Discus X at
Heppenheim and the DG-1000 at Mannheim, but not the Duo Discus XL yet!
The nicest handling of the three I've flown is the Duo Discus X.
If you think the original Duo is nimble, try the newer one. Williams
Soaring can check you out in "DDX". Believe Gavin was flying Delta
Delta X-Ray.
I think Schempp-Hirth will be in production of the XLs after the
holiday.
Jim