The best feature for me by far is Mobile Deposit. Love clicking pics of checks and BOOM instant deposit without my having to go to the bank or find an ATM.
Also transfers. The wife and I transfer funds all the time. And if my checking is a bit light when I want to make a sudden impulse purchase, I just log into my BoA App and xfer from savings so I can use my debit card. Transfers from the same bank are instant.
Gotta Love the 21st Century.