You will be fine. I am on build 10240 which is RTM and it is running very well. I upgraded my Windows 8.1 Pro to build 10147, 10159, 10162 to 10166. I then installed build 10240 and the preview watermark is gone. All this on a 4k monitor at home, Surface Pro and 2 monitor system at work.
If you have a retail copy, then Windows 10 becomes a retail copy. If you have a Dell OEM machine, the license stays with that machine just like it always would.
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