There is some recent research indicating it produces the kind of immune response that provides long term protection [1], at least if you get a strong initial response. Here's an article about that research [2].

There have been some people who have been reinfected with it, but I saw another recent article about this latest research that talked a bit about those cases. It said that they are believe to be people who did not have a strong immune response the first time. The vaccines should produce a strong response.

[1] https://science.sciencemag.org/content/early/2020/10/27/scie...

[2] https://www.darkdaily.com/mount-sinai-researchers-find-that-...