Due to the shape, the fuselage should be well aligned with the flow to prevent seperations. But from my experience with this glider, it is not really a big issue. What I found more noteable was the inefficency of the rudder and the ailerons, in particular at low airspeeds. When entering a strong thermal, you sometimes need to speed up to get her into the turn. That is clearly not necessary with the LS1-f. But many people like Libelles, too. It certainly looks nice. So to each his own.

The airbrakes of a Std. Libelle are indeed not very effective. But this is something you get used to. It is the same with ASW19 and Std. Cirrus, unless they were modified with a second panel. There are approved modifications for these two models, but not for the Libelle. Some early Std. Libelles had top- and bottom airbrakes which should work better. All LS1 have quite powerful airbrakes, they work even better compared to the double-panel brakes of an ASW19.