The Media Code for the TAIYO YUDEN is YUDEN000T01 according to DVDINFO. It's DVD+R x4 but allows burning at x8. I never tried burning them at x8, only x4 and x2.
The cheap media code is VDSPMSAB 01. It's DVD-R x4 but I burn them at x2. When I tried burning at x4, no DVD player was able to play them (including the Plextor ...), but at x2 they produce perfect copies.
The software I'm using is NERO 220.127.116.11, but I also tried burning directly from DVDClone2 with the same results.
I'm also using Memorex DVD+RW x4 (Code: PHILIPS 041) and they work great.