We're actually gonna play V&F this Friday. Adapted for the ECW.
We've played it a few times - ECW, AWI, ACW, Napoleonics. Our biggest tip/pitfall to avoid is to get units that are beat up away from the front line if you can, and rally them. Sometimes that means ceding ground with whole brigades, to maintain some semblance of order...
As for the cards, we use them with the rules as written, but we sometimes forget to use them in opportune moments, as we tend to focus on the units on the table, and not on the cards. Oh well...