Couple of questions?

[Fubar]

I've been away from the game a little while now and have been thinking of playing again.

I currently have CMBN, CMBN:CW and CMFI already, but after looking at Battlefronts support page i see that there are now two versions of the games engine and that certain patches only work with certain engines and to make sure you get the correct patches.

My questions are -

1. Whats the difference between the two engines, I know their websites sales pitch makes it sound awesome but is it really worth the cost and have they fixed things like AI pathing?

2. Do i need to buy the upgrade for each title?

3. Can someone with engine 1 play someone with engine 2 and if not which is the most used at the club?

Sorry for all the questions and thanks in advance for any help!

TTFN