Mmm looks cheap enough for Ridisc never tried them personally.
I use these "Ritek Arita Printable DL 2.4X 8.5GB DVD+R DL (25)" from here
*Rambox.***Stuff for your computer. Online. Ontime. work fine in my 360, out of around 200 disks only 5-6 coasters and i'm sure one or two of those were my cock ups.