My paint stash is about 99% Vallejo now and I love them!! they cover real smooth, lay down good on the body and are fairly impervious to masking, even more so with a primer underneath. I have use Tamiya a little and after that MM for about a year but once I found the Vallejo I have slowly been moving my paint collection their way.
If you do a lot of WWII A/C www.greatmodels.com carries the Vallejo made, Color of Eagles branded "Aircraft colors" line which is the same quality. they have all the UK, USA and German colors for most aircraft.
They also hand brush well too... it takes a few coats but there are no brush marks afterwards and it dries smooth!
If you do get some to try I would prime with something like Krylon white primer from Wal Mart or the such... just until you get used to spraying them. Maybe sure you cover in light coats progressively building up and you will be left with a nice paint job that blends together well.
good luck to ya if ya try them!!!
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if you do get them here is a cross reference of Vallejo colors to standard names. (.i.e Panzer Dark Yellow in common paint terms is named "Tank Yellow" in the Vallejo line) this was done by the member here Darson, I just hosted it on my (ok this is the only page so far) webpage...
http://www.geocities.com/tho9900@verizon.net/Vallejo_Paint_Inventory.htm