ELD's. Whose using what?

As much as I hate the idea....we don't have an option for a few of our rigs. Of all the people in trucking or who run them and have to use Electronic Logging Devices which system do you use? Pros? Cons? I've been delegated the task of determining who has to use them and what system to use. There are a lot of options and like anything some are junk, some are fair and there's most likely one that's perfect for our operation.

Any and all feedback is welcome.

ELD's. Whose using what?