I don't know about that. I bought the SF also and I like those units a lot.

It is hard to quantify.

I will go in order though.

1. Yes I would buy it again

2. For the SF edition, anything below €50

3. Yes, especially now. Those are good units and it could be a long time before you can get them as DLC, the same with the units that come from one of the distributors. Who knows if you will ever get that as DLC.

4. That is very subjective, but yes I think it has the potential to surpass MTW in replayability and I like it better than M2TW and RTW by all means.