I have never had one issue with my remington 870's. All are about 7 years old. Some people say some of the newer ones are having feeding issues that are easily remedied with a new ejector and polish.
I have also had a few mossberg 500s that had some fire pin issues and very sloppy actions. My dad has a Mossberg 835 that has been great.
I am partial to remingtons, just seem they are finished a little better.