its not so much the +/- thing but the dye manufacturer . Taiyo Yuden and Verbatim with the mcc dye being the best. Reading back + discs isn't what it was most new players handle it fine its the old players that were a problem and in some cases + wasn't supported at all .To reiterate even the best and most popular "brands " can be crap its the dye .You can find out who the dye manufacturer is by putting a blank or written disc in the BURNER and reading the info window see the disc ID Taiyo Yudens
_NEC DVD_RW ND-3500AG 2.1A (ATA)
Current Profile: DVD+R
Disc Information:
Status: Complete
Erasable: No
Sessions: 1
Sectors: 1,977,408
Size: 4,049,731,584 bytes
Time: 439:27:33 (MM:SS:FF)
Supported Write Speeds: 2.4x, 4x, 6x, 8x, 12x, 16x
Physical Format Information (ADIP):
Disc ID: YUDEN000-T02-00
Book Type: DVD+R
Part Version: 1
Disc Size: 120mm