Too loud to be really enjoyable for me

No, clee -- it is old news, very old in fact ;-) And the guy for sure didnt "invent" it.
The equipment is too heavy to really carry on your back. It is noisy. And it stinks. I should know -- I actually tried it once. I didnt enjoy it much, though it momentary felt like a cool thing. But to each his own....I like it more without the engine. Just your muscles and the sun, baby.