I took the keyless chucks off of some old battery drills that the replacement batteries were unavailable or as expensive as a new drill. I put the chucks on a few corded drills and haven't had a problem but I did keep the old chucks just in case. I still have keyed chucks on two (heavier) corded drills and my little drill press.
I think some people have an issue with some keyless chucks because they don't work the same as older ones. My newer Bosch cordless has a chuck that instead of just spinning it in your hand to tighten, it requires an extra twist without the motor running... it kinda clicks and then it's tight. Takes some getting used to but works.
All that being said, I'd still recommend a keyed chuck on a hammer drill, drill press or any drill that you often use large bits.
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