Eyup, I've got the nephews LT80 in bits & it needs a rebore & piston due to heavy scoring.

Is it worth considering the cheap top end kits, if so are any better quality than others???

 

Get a nice new Suzuki piston (next size up.. prolly .5mm) and related Suzuki parts and have the cylinder bored to the piston.
The china things are junk. They are all the same $13 kit (in bulk from Wuhan) with different company's stickers.