In total, I received 6 5800s. 4 of them were good; and when there are no problems, the 5800 is a pretty solid brick. However, the two that did have problems didn't look like they were going to last long. One of them had a HUGE gap on the top right; you could squeeze it and the two halves would move a looot. The other one only had a small gap, but there was a piece of electrical tape sticking out of it, wtf?
The 4 working 5800s actually don't creak that much at all, and since it's plastic I wouldn't care if they did anyway.