Mine have been great, no complaints. I have bought impact wobblies, chrome sockets, and larger sizes (the ones that don't come in the HF sets, such as 15/16 in 3/8 drive) and such off the Cornwell truck.
However (here it comes) my main 3/8 SAE impact set is from Harbor Freight. I have been pounding on them for quite a while now, with no ill effects. $8 @ HF IIRC. If you were buying a more speciality item (wobblies, etc.), I would definitely point you towards Cornwell, their hardline is quite good. For standard impacts
it seems to me like a waste of money UNLESS YOU SPECIFICALLY WANT USA MADE, GOOD WARRANTY, TOOLS TO BE PROUD OF, PASS DOWN TO YOUR KIDS, etc. If you're just going to pound on them and maybe loose them like me, HF is good for standard impacts.
Just my $.02, NOT trying to start any fights.
Why were you considering them??