Rechargeables are definitely a good upgrade for most applications where people use alkalines. They have better performance under high load, are much less likely to leak corrosive electrolyte, and you can use them again after you drain them. I'm a little surprised they aren't more popular.

The Panasonic Eneloop is the gold standard for rechargeables, particularly the white ones which are more shelf-stable and have a longer service life than the higher-capacity black Eneloop Pro. Made-in-Japan Ikea rechargeables are suspected of being rebranded Eneloop Pros, but I don't think that's been conclusively proven.