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Some of the Qi chargers, especially early ones, are painfully slow to charge. Make sure you don’t get one that has only 500mA output, look for at least 1000mA. If you get one of the newer design Qi inductive chargers, it will still be a little slower than physically plugging it in to recharge, but not too bad.
Inductive charging does take a little longer than a traditional wired charger, but not dramatically so. The predominant charging standard is Qi, and it’s the only one I’ve used, so perhaps a non-Qi charger would be different, for better or worse. Inductive chargers are at least theoretically more efficient that traditional chargers as well, so you are wasting power. I’d say the convenience factor of just setting your device down on an inductive charger to start charging makes it worth getting one.