Chinesium rails - value for money?, or to be wary?

I've stumbled randomly across an eBay advert (eBay, UK, item 112812638856) which advertises 20mm square rail at 2 of 400/700/1000mm (6 pieces in total), 12 carriages for the rail, and 1605 C7 ball screws and balls at the same lengths of 400/700/1000mmm (and blocks and couplers).

All for around £370 including delivery from a German warehouse (so no import duty).

Am I being naive here, or is that a pretty good price?

Okay, it constrains my design for a machine a little (from 1200mm to 1000mm) and would have to source a second screw/nut for the 1000mmm) but it looks an attractive price to get the major bits for a small hobbyist router intended for cutting aluminium. Or, are these prices (including the EU location) pretty much achievable elsewhere? (I know I struggle to get remotely close with UK suppliers).

I'm inclined to buy, but if anyone has any words of caution I'd appreciate it before I spend this month's wage.

Nope go for it can't lose. Only thing I'd say is if they have 10mm pitch would be better.

If the rails are same same like in picture, they are from the "good" Chinese ones, which are properly hardened. Its a good price, considering shipping from china will be around 200 on tthat kit