I wondered the same thing. I noticed it took two people to load it on the plane & the jet-man seemed to struggle a bit to get strapped in. Took a special landing technique that looked a little awkward as well. But I'm guessing you wouldn't notice the weight so much when you are actually flying it.
@ hika: No way that sort of thing will be open to just anyone. I'd guess it takes an experienced "traditional" jet pilot who is in good shape & very mentally prepared for something like this!