There are two unfixed problems of note I can think of - some Baltic Sea naval provinces cannot be crossed and the restriction of certain units to only be able to operate in certain areas and affect local opinion afaik does not work. There's also RUS Gold, an improved version of the game, which is in beta test right now, but might not be out for a while.
That being said, I would recommend you the game. It's incredibly comprehensive and well-designed and will last you very long time. Both the gameplay and the aesthetics will, I think, certainly please you. Especially at the current price, you should seize the opportunity to grab it.
Also, if you haven't played any other AGEOD titles, it might give you the appetite to try out other games using the same engine.
