Our company uses the VDO Roadlog, no experience with the Geo tab. VDO seems to run great and part of the appeal was no monthly charge if you don't use the live tracking. We only wanted it to be in compliance.
VDO is not a new company. Not only do they make guages and etc, but to my knowledge these guys were running the show for eld’s in Europe. So once the American market reopened I figure they decided to get in over here.
TransFlo partnered with geo tab with their ELD T-7. I’ve been using it since December 10, 2017. It does a good job for me. I like that it is not Bluetooth connected. BT is a pita in the ELD systems that use it.