Kitty,
Although I've just replied to your private message I'll reply here as well!!
Personally, I have had a lot of people telling me that they've had problems with their sudo system such as their airbrush clogging etc. This was not due to cleaning problems but with technical faults. I've also heard people say that their paints are quite thick.
I can't personally comment as I've never used the system - I'm just relaying what I've been told.
I use the Iwata HP-B airbrush and the Smart Jet Pro compressor. This runs all day long without the need to turn it off in between clients and as it's on an automatic shut off there's no noise when you're not using it.
K-Sa-Ra's Smart Jet Pro kit is also £499 and this includes 10 paints, stencils, top coat, base coat, cleaner etc. You can use this for body airbrushing but you would need a different airbrush that's suitable for tanning. There's also a mobile kit which is £335 but this is more suitable to just nails.
Hope this helps.