I have an LG RH266 DVD/HDD recorder. It apparantly accepts DL media.
Now, you can imagine where my thoughts drifted to when I realised I might find a use for those doggie discs from UKDVDR.
I popped one in, it initialised. It showed a 3h50m capacity on SP mode. It is now dubbing 'Burn Up' over and seems to record fine. I'll let you know if it plays back after finalizing the disc.