For me the critical aspects were portability, basic functions and switching - the AW3 does these all well. Assuming you remember to carry your usb-c charging cable, or one for your phone (USB-C) you also pretty much guarantee you will never run out of battery. Unlike the mx720 where you need to have AA's handy if you forget to check levels.
Yes- it works while charging.
Overall, I am very happy with it. No negatives so 5 stars.
Oh - and always, I've had great delivery services from Harris Tech.