To echo what a few other people have written - style, function and comfort are, in my opinion, the 3 main attributes helmets should be judged on and Ayrtek, again in my opinion, come out above the other companies mentioned in probably all 3 of these criteria - i'm not sure of the safety aspect of Masuri and Albion lids and how they compare but the Ayrtek is more than sufficient for the level and amount of cricket I play.
They offer things that the other manufacturers don't - A.C.I.S, Customising etc and the Premier Range is only marginally more expensive than the top of Masuri and Albions range.