Come on AirNav, you can't just leave this unanswered.
Consider. If the competition came out with a new version of their software and claimed that it could result in up to twice the number of aircraft being picked up compared to previous versions, then you (and I) would want to understand how that can be, and we would be justifiably critical if they failed to back it up with facts.
Making a statement like
In areas where there are a lot of mode-s only aircraft (no ADS-B) the number of aircraft received can double.
but failing to explain where these additional aircraft are coming from sounds a bit like snake oil to me.
Looking at the published list of V3.0 enhancements I can't see anything that would account for this - have you left something out? Granted, you are now decoding BDS2,0 frames which will allow you to display more flight IDs where previously flights would have been displayed with that field blank, but that's a completely different issue.
So allow me to ask again, what's the basis for the assertion that "
the number of aircraft received can double" (or even increase at all) with V3.0?