They will work, but the diaphragm may not last as long as a proper brand. Springs are generally springs. Seats shouldnt be an issue really for the most part.

Just generally all parts used are cheap.

£700 is rather excessive though. DO you need as big as 60mm though, they are huge ?

Precision 46mm here is only £300
http://www.powermaxengineering.com/s...49&id=15211594

They also do a 66mm...which is huge. Powermax arent listing stock though, but can easily get them