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How good are they right now? Is it worth getting one for less than 400 dollars for wargaming and scale model purposes? How good are the details, how small details can they print?

I'll direct you to my reply in this thread:
https://www.dakkadakka.com/dakkaforum/posts/list/723247.page#9304083

It really depends on what you are wanting to do. If you want to make actual figures, you still need a high-resolution resin printer, which will cost you way more than $400 and has a steep learning curve. For more basic items like terrain, or even vehicles and mechs, you can get very good results from higher-end filament printers, like an Afinia or an Ultimaker. As I said in that other thread, if you have never used a 3D printer and are new to 3D printing and design, you should absolutely not buy a printer. It's going to be a fickle, frustrating experience. If you are looking to design your own figures, spend some time learning the design and modeling side, and get your models printed through a service like Shapeways. It's more costly per item, but you can get a lot of experience under your belt with design and how that translates to physical objects for a heck of a lot less than what you'll fork over for a printer that is just going to make you mad if you've never used one before. Once you're comfortable with design (if that's what you want to do), try to find a local makerspace or something similar where you can get hands-on experience operating a printer and all that entails. Then you can make a much more informed decision and know if you will want to shell out some real cash for a higher-end model, which will give you much better results in the long run.