The latest VdN is actually not a botched reformulation... It's still a very good fragrance. That being said, vintage formulations are a bit richer, fuller, butterier.
But if you can't find vintage, or don't have the patience to wait and search, the current formulation is absolutely fine.
My rule of thumb for Guerlains is to try to find the golden package with a black square on the top front, or older if possible.