TJ, how much actual experience do you have with these dumbbells? This article reads as if you read about the dumbbells elsewhere or watched a couple reviews without actually using them.
Rock solid? A quick search on Google or YouTube would have turned up dozens of videos about various safety and usability issues with this particular dumbbell and adjustable dumbbells in general. Yet none of that is mentioned here. At least you did manage to mention that they should not be dropped which is true of all adjustable dumbbells, and regular dumbbells in general.
Adjustable dumbbells can be a great addition to a home gym. But this article is missing some information that consumers should know in order to make a better informed decision about which dumbbell best suits their needs.