I used the 75 and 50's and bought Bodeplatte, Moscow and Kuban in one go at IL2 store last week so pure Bodenplatte should be a go.
You have to be an existing customer though but I think they add the promos a few days later if you sign up.
It is quite different to il2 46 and dover and would rather call it Rise of Flight 1943 but it a well done product and contrary to DCS these guys have a very high precision and quality in their releases.
Personally I like IL2 Dover better (skins and programming interface for C# for fun mission building) but if you dislike that one this could be your title.
GB sure have way better terrain, even better than DCS in my opinion.
GB has a career mode that is rather well done but to me the missions became repetitve very soon making me lose interest before finishing the Stalingrad career (both a IL2 sqn and a LaGG3 one) - will give it a new try soon in a P-47 on Bodenplatte when the new DM is released with the upcoming patch.
Only actual downside to me is GB mission editor, first time I tried it a few years ago I just walked away but have been giving it a shot again since my purchase and you sure have to micromanage everything - far from dropping a flight on a airfield and tell them to fly their route.
Overall product quality is way better in GB in comparison to Dover and DCS.
Edit: oh, and another downside is ground handling, you will not like the ground loops. Even complaints from an old testpilot that actually flew in the 50's has been ignored.
Edit 2: here it is:
https://forum.il2sturmovik.com/topi...tion-in-bos/?tab=comments#comment-744347