Iwata w400 gun for poly

I am in the market to buy a new spray gun. I am currently looking at the Iwata W400.

My questions are ~ Is this gun a good recomendation for using on 2 pac poly and single packs like nitro, acid cat etc ?
Is the parts for this gun ready available and are they priced reasonably ?
Dose anyone sugest a better gun for around the $400 range that would suit my needs ?

I would prefer to find out info from people using the spray guns than ask my local rep that has never sprayed a piece of wood in his life.

Thanks ...Mark