I just got done flying off a pack on the Bell-Hiller upgrade and while I've not yet had the chance to do any acrobatics with it (snow on the ground... Cold... Windy...) I was able to hover it in the house and get a good feel for it.

First impressions of the upgrade kit...
It's very nice. I really like the fact that everything is together and comes with 6 ball bearings, 4 shims, 2 blade grips fully put together, and the spindle. The only thing that was missing that I thought was kinda odd was the hex nuts that the screw goes into that holds the blades on. Other than that it's very nicely put together.

Installation was easy. Just remove the old one and it litterally pops on in a matter of minutes.

Here's where the quality of the components comes in. With the old 2bb grips that I had on it with my woodies. Once I had them both set to 0 degrees at mid stick in idle 1 I would have to add about 1 full turn of pitch on one of the blades to get them to track. Not this time. I set both to 0 pitch with the new setup and then spooled it up to track. It tracks perfectly with both blades at 0 degrees in idle up pretty much through the whole gamut of stick movement. I was litterally shocked.

So how does it fly. Wow I am glad I didn't have this on the heli when I was learning. I would never have been able to hold a stable hover. I had to add in about -65% expo on the aileron and elevator to get the heli to respond as it did before the upgrade. The slightest stick movements without the expo just jerk it around. It's very precise. I can't wait to take it out to the field and turn off the expo and yank it around. This thing will be rockin. For indoor hovering though I STRONGLY recommend (if you have a computer radio) that you tune it to around -60% to -65% expo.

I'm jazzed. A lot of the slop went away that I had in the head as well but the flybar slop still remains. I really need to replace the rotor head and center hub to get rid of that slop. It's in the mounts for the bearings in the rotor head. Those things wear out SO quickly.

Overall for those that are ready to move into acrobatics I give this upgrade a 10 out of 10. Amazing. Not for newbies...