This is actually my second Viggen, Both fly (flew, in the case of the first) amazing. I destroyed my motor on the first when I was testing the motor and accidentally sucked a battery alarm into the intake. The lesson there was to make sure the area around your intake is very clear before you hit the throttle. I could have probably repaired it, but instead I chose to just build a second. Both builds were super easy and took about 2 hours. With a 2200mAH 4S and 70 mm setup, this thing flies like it's on rails. I use an Eagle Tree Guardian so it's unbelievably stable, but even with it disabled, it is a pure joy to fly. My flying skills are barely beyond that of a novice, and yet this EDF is without a doubt, the easiest plane I have flown. The only problem I have had is I keep burning up servos. I think it's because the Guardian requires no deflection limits be programmed and I like to really test the limits of this little jet. So far, I have burnt out 3 elevon servos, yet it is so easy to fly, I have successfully landed it. Last night I installed Park Zone 13 gr metal gear servos, so hopefully that will solve my problem. I honestly can't say anything bad about the design--the servo problems are self-induced (I think) and whether I fly fast or super slow, the Viggen is remarkably easy to fly. Landings are a breeze and with my setup, launches are almost too easy. I'd recommend this to anyone wanting to test the EDF waters.