Not really and upgrade. BUT, all good OEM replacement parts 'crash kit'.
589027
Not really an upgrade. But, it is a very complete 'crash kit' that has all of the most frequently replaced parts at a very reasonable price. The one gripe that I would have is that the motors don't have the connectors already on them. You will have to do some soldering. Otherwise, if your just learning to fly your Syma X8C, this kit is going to be very important to you!
745760
After reinstalling the second gear things seem to work. The first gear shattered into several pieces upon first test.
1963569
OEM equipment. Easy to change...nothing wrong with it, but man...I wish you could buy the gray swivel on the top separately from the rest of the cover. I've replaced two of these just to get a new swivel after it wears out and the ball bearings come out.
At first, these seem like they won't come out without breaking something, but if you take it slow, they will pop out and back in.
588387
Its a good outline for performance upgrade. I am hoping just for 50 hp gain. You will still have to figure out the details to make it work.
1627435
Bought the repair kit, ended up replacing carburetor. Kit worked fine, carb did not. The new carb  comes with all these kit parts already installed.
1413291
When they OEM replacement!! They should mean it. The product isn't even  close to being the same and they say it will fit my vehicle.
Lts of modification cause none of the screw holes line up.
4687180
They will break... again... for the 4th time in 6 years.  They are OEM
1333852
It sucks, no where near the power of original equipment.  Your better to get one from a Bone Yard for cheaper, as long as it is OEM.
973387
Nothing pisses me off more than buying aftermarket crap that swears up n down that it'll bolt right on...and then it doesn't.
I wish I had just boiught the HD gear from the start.
WASTE OF MONEY.
3776148
You need these parts for the inevitable crash.  You will be do glad to have them on hand.
1618006
Suggest you raise price and include some accessories.  Can't even try without basic parts!!!!
2804831
Jeep is lucky there was not a major recall or lawsuit. The OEM parts are garbage and you have to use this modification. Get the Dorman regulator and modify it with this part.
2042973
It's always a safe bet to get one of these replacement part kits...or two, or three lol. Depends on how crazy you love to fly. Haven't had to use any of them yet but they are sturdy and look very easy to replace.
1461031
It's no name kit. The good - it's a complete kit with all needed parts. The bad - it doesn't feel or look as solid as the original part.
3795942
Cast pieces don't fit into handle without modification
Cast pieces don't even slip over the tumbler
Spring is a softer rate than OEM

Good way to lose 2 days and $7

Update:
After reporting poor fitment and need for modification, the seller offered to supply another set for free.
I had already modified parts to fit, but at least they tried,
2180998
There are many inferior non-oem replacement parts available. Beware of impostors and make sure you purchase lamps and parts made by the original manufacturer.
4481356
New Oem part, correct fit, acceptable prices(better than what could be "ordered" locally) what else do you need!!!