We've had mixed success in some areas and very positive experiences in others. In our case, we issued tablets to our utility plant workforce; all can now log in and complete training using the tablets by accessing the corporate LMS. This is a good thing, once we got the protocols ironed out and documented.
At the same time, it also underscored an identified gap: who's responsible to support both the learner/employee and the tablet/device? And that's been both a thorn in everyone's side and an opportunity, for the group that is willing to own it. And who will own the costs of upgrading the devices in three or four years?
It's a journey, not a destination, and there will be a time (sooner, we hope) when employees will access and complete training on mobile devices, like they are doing with typical work tasks (completing work orders and such). We're closer than we were two years ago. But we're dealing with a great degree of organizational stubbornness / resistance to change; though it's far less than what it was, we still need to eliminate this barrier in order to have more regular completion of training on mobile devices.