The newer flip top lids are a LOT better than the older twist tops, but I have some truly ancient citadel paints in the antique "castle" bottles that are still good now, they have to be 15 yrs old.   I do like there washes and foundation line, these are fantastic and it is still a great brush paint.  But like any paintline, they all have there uses and attributes it just knowing what those are and how they can work for you.  Incidentally,  the P3 line is made by the same factory that made those ]oldlast for ever citadel colors it is also a great brush paint.   We are starting to head off topic,  maybe this thread needs to be paint line attributes?

Tamiya: Is my preferred airbrush paint, needs thinned to brush well.  limited by colors available and somewhat hard to find.

Modelflex,  just got some of this stuff, it airbrushes REALLY well,  right from the pot.  I really like the convenience.

Model Master enamels, this is a huge line that is actually really well researched for color and shade. It brushes well and airbrushes well, but its a enamel..........

Polly S,  this was great while it was in production,  it was assimilated into to TESTORS (the borg of model companies?)  really hard to find,  I hear good things about the ACRYL line but again not well stocked around here.

Floquil made great railroad colors, but its a lacquer, its also old school model tech and its the nemesis of anything plastic.