In reply to MattKelk:
They'll be fine quality wise but be aware they're an old design, they don't have full strength cam-stops.
Cam stops, in case you're unaware, help prevent the cam from 'inverting' and pulling out if placed too-open or if it walks into a wider part of the placement. They're worth having, the meagre money saved will be no consolation to you if you ever test the stops.
http://www.v12outdoor.com/catalog/product_info.php?cPath=69_39&products... these are only a few quid more, top quality, light, have stops and the bonus extendable sling of course.
There'll be similar offers available elsewhere and on WC tech' friends.
Buy the best kit you can if you plan to stick with it.
jk
jk