the dmg is okish with double umbrella but its more of a looks cool thing, I think its better to get an air combo, then pick up with either 22 a+b or a+k b and follow with the relevant follow up. Also you can get AA after a+k b which is handy if your have a injury which prevents slides xD
3B w! 33B 2142a:B w! A+K B 2143a:B
it does more DMG than the clasic 3B w! B+K combo.