DSA certainly needs extra flights, as a PPL holder I'm amazed at the number of AT movements a day for the size of the airspace. I was refused entry a couple of months ago & I only wanted to clip the NE corner of the airspace. Aparently a single Wizzair on approach to 02 means a non transponder equipped airctaft overhead Gainsborough tracking North at 3000ft has to do an immediate descent to below 1500ft to stay outside the airspace, ludicrous! With only 5 or 6 AT inbounds a day you would think they would encourage private traffic.
I now have a working Mode S but won't be going near DSA again as I don't want to be used as justification for the large amount of controlled airspace. Rant Over!