I've got two record power SC4 chucks, the first one in a combo set at £130, also all the jaws to go with them. Good value and had no trouble with them. Plus to boot, you can change the inserts of your chuck, to other turning lathes with different threads, for about £20. That's value for money.
I also have an old S80 chuck, made by Axminster, fixed thread. Only use that for dirty jobs, not much good.
Kelvin