[searching dug an old 2015 thread. Adding to it would have resulted in zombie panic, so here I go...]
I've ordered
Redshift's L clip on bars, which may or may not fit my current handlebar. Worse comes to worst, i'll have to return them.
I don't expect significant performance improvement, but felt quite often, after long hours in the saddle, that aero would be a welcome change of position.
Being clip on, it won't interfere with flying / public transit. Probably imply ditching the handlebar bag, though.
I'll read opinions / sharing of experience with interest. Especially related to handling (I don't plan to add brake levers, I ride with fork packs, I am getting old...)