Rated 4 out of 5 stars
I'm a daily user of StumbleUpon and love it. I don't have any of the issues that I am seeing people write about. It works great and I am still happy with it.
The only times I had problems with Stumble was due to browser issues. I had problems with it freezing up when I was using Firefox so I switched to Chrome and problem solved. Then with Chrome I found that if I clicked the back button it would jump two pages and being this was over six months since using Firefox, I switched back and Firefox seemed to have fixed there issues and problem solved. I don't see these issues being Stumbles fault. And with anything computer related there are bound to be issues now and again so I am not upset with Firefox or Chrome since I was able to find solutions easily.