In my opinion product and price ratio is really good, you get what you paid for though (chuck is not German or Swiss top quality, but for home users it's ok). As the chuck is so cheap you need to do some chamfering and cleaning yourself.
I bought the 10 inch and its good runout is good one piece body the only iffy is the plastic cover on the back for the ring gear cover but it seals good with the plastic so maybe not a fault ?
I adapted this to fit an antique Southbend lathe. I inherited this from my father. The 4 jaw chuck worked for me for years but it took a lot of time to use . I had to make my own mount for this chuck and it came out great and the chuck is centered really nicely. I would have given it five stars but I had to disassemble the chuck and clean and lube it up to make it open and close smoothly.