Queries on Mr Hobby Airbrush & Sparmax Compressor

[Guest]

Hi everyone, would appreciate some help here.

I'm looking to get an airbrush for painting Gundam scale models as well as the usual military models like tanks and ships.

I was looking at this from Mr Hobby:

http://www.1999.co.jp/eng/10041007

http://www.1999.co.jp/eng/image/10041007b/30/1

Things that I like about it:

1. Double Action

2. Trigger Grip (my index finger is weak hahah - can't press the usual airbrush buttons easily)

3. Ability to change from circular shape to fan shape (it just sounds good to be flexible, but if someone can tell me when a circular shape is used and when a fan shape is used, that would be really helpful).

I am also looking to pair it with a cheaper Taiwan made compressor, Sparmax:

http://www.sparmax.com.tw/airbrushing_system_2.html (the first one).

My questions are as follows:

A. In general, are airbrushes compatible with other brand compressors or only their own brand compressors? I read somewhere about someone saying I MAY need an adapter to fit it, but am not quite sure.

B. Why is a fan shape good?

C. What size airbrush should I be getting, 0.2 0.3 0.5? Is there such thing as an "interchangable size airbrush"?

Thanks in advance!