Scant documentation and the lack of a start-to-finish Grand Campaign spoil an otherwise promising game
To be fair, "development" was done by a small team of enthusiasts of the original games, not dedicated developers. The attention to detail in many areas shows their love of the subject matter, but the game comes up short in the "polish" you would expect on most any other type of commercial title.
The order-giving process for the side conducting bombing campaigns (the Germans during the Eagle Day/Battle of Britain portion, the Allies in the Bombing the Reign portion) is still too laborious to be any fun at all, and might make the game unplayable for many. Expect an hour for each one day turn in the Battle of Britain scenarios (when weather allows missions), and probably two hours once the campaign starts to ramp up in Bombing the Reich - if you want to do it correctly. The AI can plot missions for you, albeit quite a bit less elegantly than most human players might like.
Players familiar with the original games will probably enjoy being able to play it again on today's newer operating systems. However, the graphics are little improved from the original versions. Strategy gamers are probably able to overlook the weak graphics, as they are used to it. The game is limited to one screen resolution and cannot take advantage of today's wide-screen monitors. If your monitor is set to a high resolution, expect to adjust your screen resolution downward to get something that you can comfortably see and play.
The most disappointing aspect to me is the lack of a start-to-finish Grand Campaign that takes the player from the Battle of Britain through the end of the air war over Europe. Instead, you get two separate games that must stand alone.
Finally, the documentation is simply abysmal. There is no printed manual, only .pdf files and those are woefully short on examples of play considering the complexity of giving orders in this game. Most glaring it the fact that it is completely silent on how to start a Play by e-mail game, leaving players to sort that out for themselves.
Overall, a game worth playing if you really love the subject matter, but not recommended for casual gamers.