I had a heckuva time trying to get these darned things (checks sent electronically to be printed by the receiver) deposited via ATM or remote deposit. Then I read a forum post that suggested trimming an additional half inch from the bottom.
I pulled out a standard business check and matched it to an Echeck. Sure enough, the bottom margin on the Echeck was noticeably wider. I held my breath, carefully trimmed... and the Echeck went into the ATM with no problem.
Now I have no difficulty depositing payments from my clients who use Echecks.