As far as your project size is concerned, they would be ideal. Milling the pocket is an easy project, but the speed will depend on the material, depth of the pocket and the tolerances you need to hold. If the corner radius is small, you would probably use a larger end mill for the hogging, and then do a tool change to a smaller one for the radius cuts.
Noise wise, I would guess that the machine operator would be more likely to be bothered by the other shop employees.
Price wise they are hard to beat, when you consider that you have both a CNC mill and a CNC lathe for the 5K. Trying to get equal size separate machines each fitted with CNC would be 2-3 times that amount in the used market. Buying new would be at least 4X.
All in all they are a good value for the money, but be prepared for the standard issues of Chinese machines- final tuning, cleaning etc., and go into the whole project with realistic expectations. Remember that you will have a learning curve both in manual machining and CNC operation as well, so you won't be cranking out parts the first week.