Trademe USB SATA enclosures

I could really use one of these, Trademe is full of them and they are dirt cheap.
e.g. http://www.trademe.co.nz/computers/exte ... 886226.htm
...BUT why do all the really cheap ones say "supports max. 500 GB"? 500GB doesn't correspond to any SATA limitation that I'm aware of? The only ones that say "support 1TB" on there are all priced 2-3x as much.
I'm running a 1TB SATA through a SATA-IDE adapter in the dock of my 8-year-old laptop, and it works fine... I can't imagine a product being made in 2014 not supporting TB drives.
Is this just a mislabelling/marketers-having-no-idea-what-they're-writing thing? Should I just buy one and assume it'll "probably" work?
e.g. http://www.trademe.co.nz/computers/exte ... 886226.htm
...BUT why do all the really cheap ones say "supports max. 500 GB"? 500GB doesn't correspond to any SATA limitation that I'm aware of? The only ones that say "support 1TB" on there are all priced 2-3x as much.
I'm running a 1TB SATA through a SATA-IDE adapter in the dock of my 8-year-old laptop, and it works fine... I can't imagine a product being made in 2014 not supporting TB drives.
Is this just a mislabelling/marketers-having-no-idea-what-they're-writing thing? Should I just buy one and assume it'll "probably" work?