I would think that any URC training is worth 3 hours of your time regardless of which platform they choose to make their training example of. You might learn some valuable tricks from the trainer that can be applied to other URC products or other control systems and most importantly you get to hear other programmers questions which will bring up answers to things you've never thought of before.

But if you're going to learn just programming a MX780 then you are definitely wasting your time.

That's just my opinion.