I'm on several internet forums that discuss things from tractors, snowmobiles, snow blowers, to guitars and motorcycles. You should see the furious posts about Chinese bearings in $15K snowmobiles, Vox guitar amps and Celestion speakers all made in China, and Chinese iron castings on $50K John Deere tractors. The common theme seems to be that the Chinese CAN make very high quality products when they want to. It gets down to the tolerances, quality control, and oversight of whomever is having those products made.
These saw kits are very interesting and sound to me like a handyman special, potentially good for someone mechanically inclined, not so much for the average guy that's put together a few Ikea book shelves.