Posted for Charlie Kohler <charliekohler@yahoo.com>:

 The person who was my leftseat pilot (was finishing up his training) is an
active-duty Air Force test pilot and graduate of the test pilot school.  He
has experience in most F series fighters.  His comment was the airplane was
much more "crisp" and required less control forces (aileron) without the
wingtips.
 My opinion having flown many many Lancairs with and without winglets, and my
own of course, I feel it is a big difference.
 Much lighter control forces, better roll rates, easier to fly. IMHO
 
 Charlie K.