I am a recent (well again) convert to the Iwata. I have been using the H&S Infinity 2n1 for the past couple of years and frankly it is just not a good airbrush. I agree with Denstore here, the sloppy trigger and lack of precise fit is an issue along with the seemingly never ending need to replace o rings and seals just makes me loathe using it. I have also never gotten a happy medium from it. I could paint the same paint mixed the same way two days in a row and one day it would spray "ok" and the next it would spatter and sputter and bubble like you would not believe. I have literally just taken delivery of a new Iwata HP-BS and I absolutely LOVE it! Even with a .35 needle in it, I get a much finer line and much better relaibility during a paint session than the H&S.
In fact, I am selling my H&S once I get some pics of it. The Iwata is THAT much better for me. I have owned probably 15 airbrushes in my model lifetime and have tried every brand from Binks & Wren, Badger, Paasche and H&S and here I am back with Iwata....just like I have always done.
Cheers
Mike
PS: try the brushes you may be interested in at shows. You will get a much better feel of what works for you. We all expect different things and have different ways of painting so someones Ferrari may be your Trabant.