I've got a Pioneer 106D and I've recently bought TY DVD-Rs and DVD+Rs for the first time. So I burnt DVD files onto both the + and - Rs and ran the Nero CD/DVD Speed Quality Test. The results was pretty bad for both discs as I got maximum PI errors of >300 and quality score of around 60. Tests with a Datawrite Classic Grey discs I got max PI errors of <200.
Btw they're Fujifilm DVD+Rs2 from here and the silver thermal printables from svp.co.uk