What are your experiences with the newish water based enamel paints (eg Dulux Aquanamel)? How do they compare with the traditional oil based?

Are they as good as the standard enamel paints in terms of durabilty for doors, skirtings and architraves etc? Do they really yellow less than the traditional enamel paint as claimed by Dulux?

They are definitely easier to clean up, but are they really as good and hard wearing?

All you professional painters out there, how do you compare the two? Which do you use?