I've found that these do indeed burn very well on the 1620 - and they produce a near perfect 8X overburn. Also, they are perhaps the most inexpensive +R discs available that actually do produce a quality burn.
But I don't use them anymore because of the following two issues:
1. They're labeled with big black writing on the the top which makes it a bit difficult to find space to write your own information (particularly bad if you're writing six AVI movies to the same disc and you need most of the room to write all the names down )
2. They only overburn to 8X and not 12X (yeah, I know - I'm a bit greedy :bigsmile: ).
I've found that 8X +R SmartBuy Prodisc R03 discs burn just as clean at 12X on the BenQ 1620 as the Philips discs do at 8X. The company label on the top is mostly transparent so you can easily write over top of it. However, they are slightly more expensive than the Philips discs.