Pretty good. They’re alkaline rechargables, so they last longest if you recharge them frequently, instead of draining them all the way down like other batteries.
I use them in my Xbox controllers. Every couple days I swap them out for a different set and throw the old ones on the charger. Worked great for a while now.
I bought a couple of sets of these for a variety of uses.
In my wireless mouse and keyboards, they are stellar seemingly lasting as long as regular alkalines. Highly recommended.
I also use them in my hotshoe mounted flash (Canon 550EX). They don’t do quite as well as non-rechargeable alkaline batteries, but at the price they are still recommended unless you are going to be a long way from a power source for recharging.
FWIW, I picked up two sets (two chargers/16 batteries) in January and they are all rocking.