Before you buy Phase 3, I would get a copy of Phase 2, which, IMO is a great sim in it's own right. If you're not used to flying WWI era aircraft, Phase 2 will allow you to get a "feel" for it before jumping on Phase 3 where the AI is much deadlier! Just look at it as a training exercise before the big push. If you would like a copy of Phase 2, I could send you one, no charge, unless you're the kind who likes to dive into danger head first! If you are that kind, by all means, order Between Heaven and Hell, either way you won't regret it
CJ
PS: OFF is not a scripted sim. Every campaign is different. You could join at the same date, same squadron, etc, and it will be different from the last. That's the beauty of it, no shortage of surprises! Unfortunately the war always ends the same way. You can recreate history, but you can't change it, though some have tried.