Polling of Overdrive readers over the course of January and parts of February showed relatively minor impacts of FMCSA's ongoing 'crackdown,' so to speak, on self-certified ELDs listed in its registry. At least a couple dozen have been revoked over the last year or two. Among no respondents, 4% noted the crowded market for the devices, with hundreds of providers. That 4% had to replace a device after another company among providers went out of business.