It's actually not, and they are extremely easy to fly. Myself my buddy who also has disposable income decided we needed to find a new hobby. We do this about once a year or every other, waste money on something (this year is off shore boats), we use and abuse whatever our new toys are, and then sell them and move on to something else.
We bought two blackhawks in 2012, even paid for training courses which was a weekend trip. We do our class, feel totally comfortable, "pass the test" (everyone did) and we traveled back home.
We scheduled a trip to the sand dunes to fly our new toys on the following weekend. Go to the state park, setup, had to use the instruction manuals because we had forgot a bunch of stuff. Anyway, we're in the air, flying, no issues. Within ten minutes of being in the air my friend circled around and was roughly 500' to my left. (we were told to leave 300' between gliders) I start veering left, he starts veering right.. 400' 300' 200' 100', I'm starting to get slightly nervous.
I change direction to the right so I'm running parallel with the lake, he gets within 50' of me on the left and is trying to light a roman candle with a zippo lighter to shoot at me for a joke. I watched him try to light it for 30 seconds thinking that was the funniest fucking thing I've ever seen in my life. We are 1000' over the dunes, it was a beautiful day, not a care in the world, and my buddy is going to try to shoot me with a roman candle. Luckily the air movement was to great, and it wouldn't stay lit, but then it hit me.
What the fuck are we doing. We're going to die. I immediately pulled a slow 180, landed back at the park. He followed me. We both landed without issue, packed up the gliders, wheeled the fans back to my trailer, all without saying a word. Helped each other strap them down and jumped in the truck.
I said "you know we're not going to live long with these things". He replied "yep, first and last outing for me".
We both sold them within a month of taking our class, and we both logged one flight without an instructor.