I bought an SGS jack.
It was rubbish, with an inherent design flaw (the handle was attached with a tiny metal clip with no bracing).
It broke, and I was told I could send it back and they might repair it. Or they might not. And they wanted £20 for postage to look at the £40 jack.
I'm far from the only one with this experience.
I junked it and bought one of the Costco ones which is in another league (admittedly 3x the price).
That died after several years so I got a Sealey one which is identical, as Sealey sell all the spares individually for only a couple of pounds.
EDIT - I'm not on their mailing list, and I bought the jack maybe 7 years ago so when I got this email the other day entitled "Time to Replace That Tired Old Trolley Jack" I thought it was some kind of joke from them... as it's their crappy jack that got replaced!