We take checks, e-checks and checks in the mail. If the check is less than $25, we don't hold it for clearance.
With echecks, you get a notice when the check clears. So that is easy enough.
With mailed checks, we haven't had one that is over our $25 policy.
I find that even with us accepting checks, we rarely get them. Maybe 10% of our sales. And of those, maybe only 10% are actually mailed. It happens often enough that we don't want to stop accepting them, but not so often that it is a hassle.