I've used this option on numerous occasions with numerous books. The only time I had a problem (and it was a big headache) was when I unknowingly had a typo in my bank account info. The book (Olympic) still deposited the funds and I bet off of them. At some point (a few days later) I went clean and redeposited with E-check. I eventually got up about a dime or so. About 10 days after the first deposit mentioned, I logged in to find my account frozen. After numerous phone calls over a 24 hour period to the book, their 3rd party vendor, and my bank, it was finally determined that their was a typo in the account info on the e-check form. Olympic initially indicated that weren't going to restore the funds to my account. They eventually did since I had made a deposit that cleared after the previous one. Meanwhile, the whole episode cost me a chunk as I swept the board the night the account was frozen (turned 500 at another book into 2000).
Anyway, I think E-check is just about the greatest invention over the last few years in the industry. Just don't make a typo.