I built mine as a 7S power setup spinning 580/106 blades, and it flies superbly well. The build was fairly easy, but the manual could benefit from more details. All the components are well designed and nothing feels odd or cheap. The stock 4.21 tail gear ratio is a bit low for my taste. The optional 4.44 tail gear ratio gives more tail authority, but I had to increase the tail size to 106mm tail blades to get the "no holds barred" tail authority I wanted, but I would have preferred a higher tail gear ratio option to begin with. To accommodate the larger blades, I had to resort to the larger Tron 7 tail fin, which also meant I needed to raise the tail off the ground for enough tail fin ground clearance. I achieved this with a 3D printed 5mm thick spacer (see pics). The tail case uses the same awesome collar design as the larger Tron 7 sibling to eliminate the tail shaft lateral play without resorting to shims. I love this design.
The canopy looks awesome, but it was rubbing against the 4025 size motor I am using. I created "air holes" on the canopy to clear the motor can. The canopy still looks great, but I wish Tron would just sell canopies with these motor clearing holes (see pics), so one does not need to use modeling skills and tools.
Just like the Tron 7, this Tron 5.8 canopy rattles against the frame on the front bottom aspect (see pics) which WILL lead to canopy damage if not addressed. I used door insulation to remedy this issue, and it works fine now, but it is something to be aware of.
After using my modeling skills and personal upgrades, this is an awesome flying and sexy looking helicopter, and I would repurchase and rebuild it after a bad crash, but I feel I needed to remove one star from the rating due to all the "extras" I needed to use to get this helicopter to function they way I wanted.