seen this deal on hotukdeals, apparently these use RICOHJPN-D01 dye same as the Aone cheapo discs. This is also one of the most faked media dyes on the market so the likelyhood your getting genuine Ricoh dye is low.
A lot of people have had good resilts with the Aone discs but the general consensus is that RICOHJPN-D01 is poor quality (unless you get the orignal branded Ricoh discs).
Personally I have had no success with this dye on Aone discs using a Pioneer 111D with latest 2.19 firmware, so far 5 coasters from a pack of 10 generally fail at the layer break 50-58% complete.
Check out cd freaks for posts about RICOHJPN-D01 not very well regarded high error rates on scans etc. Might be worth a gamble at 13 quid, I wouldnt bother trusting any important data to them though....
Your 360 will most likely stop reading discs if you use this kind of media over time.
So I take it these would be no good for 360 bakcups then??