A complete pig that could barely fly.
You know, you don't need to toejam on every wishlist post for a non-German unit with your incessant demands for only German units to be added.
Better gun than the 57mm. Unless the tse-tse used APDS rounds, anyway, althoug I've never heard of it using them.
Depending on how hard-hitting they model the 57mm rounds (look at how the 37mm rounds for the BK 37 were), the Hs 129 would be a more effective tank-buster, particularly against heavyily armored units like the Tiger I and II, or the IS-2 if we ever get it.
We're talking like 82mm of penetration vs 136mm. Thats a big difference.