I thought I'd wait and see what came of the 'Betamax/VHS' situation but have taken the plunge and bought an SE2. I've yet to use it but testing on the ground it seems to work well with SkyDemon and for an additional £30 to SD you can add Flarm reception. As I already have a mode S transponder though it will only be used for reception for now. I'm looking forward to seeing it in operation.
The SE2 appealed over the other kits as I didn't want additional aerials and cables stuck all over the panel and being IFR equipped I also didn't want the compass affected. Putting the SE2 on a rear window and keeping it well away from the panel should hopefully prevent any interference.