At Checkbook.io, you can send a digital check to anyone, and receive a digital check from anyone. The initiator (sender or receiver) pays a $1.00 fee per transaction. Both parties have to verify their identity. This verification happens instantly if your bank is one that Checkbook has partnered with. If not, you must use the micro-deposit verification method. (Checkbook states they provide instant identity verification on 75% of their transactions.) The sender’s bank information is not shared with the recipient, nor is the recipient’s info shared with the sender.
In short, Checkbook seems to be an easy, fairly cheap, and convenient service. My bank charges $3.00 to send ACH transfers, so Checkbook is a great alternative.