I've got a Badger 200 that I've had for a long time. I don't use it much anymore, but it does still get some use from time to time.
They are good brushes, simple and reliable. The only weak point is a Teflon washer between the head and body that tends to flatten with age and cause a pulsation of the air flow.
They have, I think, three needle / nozzle combinations available; fine, medium, and coarse. I think most of them come with the medium combination installed. With the fine needle and nozzle, they are capable of pretty fine lines.
Personally I prefer the Omni 3000 (siphon feed) or 4000 (gravity feed). Both are double action brushes, and after using a DA brush I'd never go back to a single action brush for anything more complicated than general coverage. I just don't have the level of control from a single action that I do with a double action. The 3000 costs about $60 and the 4000 about $70. My recommendation would be to start with a double action brush, but if you want a single action the 200 is a good one.
Keep in mind that about 90% of the abilities of an airbrush are the person behind it. They take some practice to get good with, so your first few attempts with one may not be what you expected. Practice is the key and there is no substitute for it.