I received mine also and agree with his assessment below. However, I don't think I would have ever spent $40 for them personally. They are neat and the idea is good but the price point just seems high.
I just wanted to follow up here. I received a free 2 pack of these. They shipped right away and I got them very quickly. Upon examination they appear to be well built and water tight. The construction seems very well done with attention to detail. I plan to do a few stress tests to see how they hold up. I will update when done. Thank you!