Purchased these to share with my teenage son with limited space. I performed an enormous amount of research into adjustable dumbbells and ultimately chose these. Have absolutely no regrets.We switch back and forth between weight preferences easily and efficiently. And the range of incremental weight selection is the absolute best out there - largely due to the hidden 2.5 lb removeable handle inserts. If you can do simple math, you will easily understand.As I suggested in the title, I've no fear of these coming apart overhead or above toes. Even the highest rated, competing adjustable dumbbells on the market almost all have truly sketchy locking mechanisms counting on buttons or ratcheting dials that will absolutely break at some point, or on pins that will stop pinning, and a most also have wedge like shape designed in the weights meant to hold- but should and surely will always linger in one's mind that they may come apart if jostled ever so slightly the wrong way- or just an accidental bumping together of the two dumbbells above your chest. No thanks to that. I'll stick with these.Even in such a case as the slide/selector on these somehow breaking, it's simplistic design will easily allow for a safe replacement alternative to be purchased (or even made) instead of a complete rebuild or garbage toss like the others that count on too many internal, proprietary parts.Made of solid steel, really good welds, and again, K-I-S-S design.I also chose this model because there are weight upgrades/additions available- up to 90 lbs each. At my age, I doubt I will get back to that level, but good to know as my sons may be there sooner than later.
Rating: [5 of 5 Stars!]