Bought the expensive adjustable dumbbells after giving up on two other sets, still not sure it was smart
There's a spinlock set under my bed with the collars still half done up. Swapping plates between exercises took long enough that I kept skipping whatever came next, and eventually I stopped getting it out at all.
Then I tried one of those dial-adjustable sets. The plastic selector cracked. I looked at used ones after that, but a Marketplace photo doesn't show you what's cracked inside, so I walked away twice.
By the end I'd stopped comparing prices and was reading warranties instead, and the ten years is what settled it. Whether a warranty like that means anything when you actually try to use it, no idea. I picked up the PowerBlock Elite EXP pair this month.
They look like metal bricks and they cost $400. Mine are the 5 to 50 pair, I passed on the expansion kit. The weight change takes a couple seconds. I haven't skipped an exercise since, but it's been weeks, not years, so that proves nothing.
Whether they hold up, I'll find out. If anyone has had a set go past five years, I'd like to hear what broke first.