Well, a month in and I thought I'd add some comments after a fair bit of use.
I ended up buying a 0.2 needle/nozzle set, as I found the 0.15 a tad small for some uses, and although it's not a big jump in size, it does make a huge difference to the performance especially with Vallejo Model Air (I don't tend to use this much, but when I do, I find it doesn't work as well with a tiny nozzle). The 0.4 is perfect for primers and some base coating and the 0.2 spot on for all but the smallest detail work!
What I love most about this brush, is the ease of cleaning in between colours, this means that I am happy to take the cup off, put 2 drops of paint in just to paint 2 forgotten undercarriage doors!! I would have never done this with my ultra, as it meant (well, in my experience anyway!) a strip down afterwards. Also the finish - it sprays a beautifully smooth coat, silky smooth, and appears to be economical with paint.
The chrome coating is very robust - although I have stopped using Windex on my airbrushes (I was warned, I know!) and at the end of each session, it looks brand new again.
I painted my F4 Corsair with it, and it has been the most pleasurable paint job I've ever experienced, by a country mile!
And, finally, after using it pretty much every day for a month, I can't find anything negative about it at all. That speaks volumes!