Having worn them multiple times at WDW, they are nice and convenient if they are giving them to you for free. The thought of having to charge the new version makes me never want to buy them- and even if I didn't have to charge them, I don't really need one more thing I have to pay for at WDW/DLR. The prices have gone sky high without adding that too.
That said-- there is one instance I can think of where it might be worth it. If you are the one that manages the
Genie+ account, and if you don't let your teens (or other family members) log in and use it on their phones. With the Virtual Queues and previously max pass, I'm always the one that pulls out the phone and scans for everyone. If you have teens or family members that go off on their own or don't want to stay with the group for LLs, etc., then having their own magic band linked to their name on your account that they can just scan in can be useful. Sometimes we go with friends. I can see myself buying a band for my DD, so she can go off with her friend and scan her band for a LL I have set up.