ELD's in Owner-Operator Trucks

I heard ELD's will be required soon. The broker I have leased my truck to started requiring ELD's on new leasee's last fall. I "tested" the Tablet solution they are using which is from JJ Keller. It had so many errors and flaws that I removed it the next day. Wanting to improve on the accuracy of my paper logs, I purchased a ELD from a T/A Truckstop. A Rand McNally TND760. I'm very pleased with it. Infact, on my last trip to California I got a level I and passed with flying colors with my TND-760. I didn't like that I had to make a 3 year contract. But 1 added feature I love is the ability to pull codes with it from the ECM with plain text descriptions. I haven't had in log violations from the internal department and I love being able to tell the Service Manager exactly what is going on with my truck in terms of engine codes and lamps. Unfortunately I learned that my broker will only accept the JJ Keller tablet solution or the Omnitracs MCP-50. I have 12 months to comply or find a new broker. Anybody else thinking along these lines? Been there done that. Can the broker really refuse my ELD?