Can’t say I’ve ever heard of them. I think the two sellers that are generally agreed upon to have proven to be high quality are retrogamingcables.co.uk, and Retro Access (aka retro_console_accessories on eBay). I’ve used both of them and have had nothing but amazing cables.
Personally, I’d only buy from these two people unless I heard lots of good things from people I trust about another site. Paying top dollar for cables sometimes sucks, but I’d rather just bite the bullet and get something I know will be right the first time, instead of trying to cut corners and ended up with a faulty or substandard product, then having to pay for the good stuff anyway.