I am reading a lot of comments of the flapped V2 having a significant edge on performance. This may be true in very strong conditions. For average European competition weather conditions I tend to disagree.

In the 2012 qualifying competition at Hockenheim both Standard and 15m classes were tasked the same to compare the performance differences. Comparing the average speed of the podium finishers results in 101km/h for the Standard class and 100km/h for the 15m class. Unfortunately there were only three days with speed finishes, so the numbers are surely not fully representative. Nonetheless, the first impression is that the performance difference can only be marginal. https://www.strepla.de/scs/public/overview.aspx?cID=171

In last years German Nationals in the 15m class, a D2a placed second of 35 participants, narrowly missing the title of German Champion on the last day..
https://www.strepla.de/scs/Public/sc...in g=20170714

From my experience team flying with an ASG29 15m with an LS8 it takes speeds in excess of 170km/h to really start noticing a difference.

In my opinion the best argument for flaps is: it's more fun!