I had one similar to this but single rotor... The first time I flew it... It smashed into the ground and bosted the rotor.... I've only got one spare set... so I've never used it since.... Do the double rotor ones fly better???
Yes, in theory it is more stable than a single rotor which makes it easier to fly for numpties like me. I have crashed it a few times though... have broken one set of rotors and a drive shaft. Ouch. Spare parts are readily available however...
Good fun though. Still can't believe that it flies!!!