Yes Dieter, I noticed that there are a few areas that need a bit of work. Mostly navigation related. And I agree that it looks like they won't be fixed by by Sibwings. It's a shame. He has a great product that could be perfect if he'd only take a little time to get it right.
I personally don't use the BirdDogs' navigation anyway, I use it strictly for VFR and sight seeing. The plus's for me are the fantastic views. Look anywhere and you can see out of a window, just great. The flight dynamics feel good to me, but then I've never flown real world. It's an ideal plane if you want fly hands on. If you want to kick back, set autopilot, and go for lunch, fly a Carenado
Or anything else of that genre.