There's several flavors of Vallejo... I am not an expert on it as I just picked up my bottles last weekend. But this guy at the LHS showed a Albatross he was working on and it looked SWEET! He said he used only that paint since the first time he tried it... it's neat, goes on well and look good. I believe Woodbeck here uses them so he should be able to answer this better.
The guy at the hobby shop said you could go online and they had the proper mixing ratios etc for it along with colors.. (haven't done that yet) It comes in model colors and airbrush colors... the model for brushing and air for airbrushing...
I have also heard a lot about them which is why I asked about them at the LHS. From the response I got this is the way to go!
All the RLM colors were labeled as such, the RAF interior green was there etc.. so I don't think you should have to much problems picking out your colors...
Here is the link:
http://www.acrylicosvallejo.com/
just click on the british flag and it is in english... at the top middle, select model colors, then there will be a page come up. scroll down and look for equivalancies... it will map each color to its RLM color, RJN, USA etc.. color...
if you plan to airbrush with Vallejo, the guy at the LHS was strongly recommending using their thinner... he said it seems to level and stick better...