I found the AS355 seat suited me quite well (but then again, after years on the apalling one in the military Puma, especially when wearing an armoured breast plate, anything was a good seat).
But I don't like the thought of it breaking clear of the floor mounts in an accident!
I found the Blackhawk one most comfortable and it is a very strong seat, with an excellent safety tolerance for a vertical impact (not that I usually need one
).