Ofcourse it is.

I think you are right about it being good for people who 'cant control their model' but for experienced modellers it can allow you to sail closer to the wind if you dont mind the pun. Like traction control on race cars it just allows you to get more out of what you have without worrying about it going wrong.

As far as watching it sail off on its own then I suppose this would be fun for a few minutes and then get a bit tiresome. However if you like tuning engines and making the thing as fast as possible then having an on-board controller than can sail it flat out in a straight line to test it's speed and record it's top speed is the best way to see what your machine can really do.