I had mixed results with KHypermedia DVD-Rs.
It seemed to depend on the batch (sometimes even on which disc you picked within a batch) and also on the package (for example the 5 pack in jewel cases [at the time, haven't bought them in a while] worked fine, while the 10 pack in a spindle produced coasters 90% of the time.
The 25 packs were better. Since they were only 1X, I gave the remainder (6 -7 discs) away to my brother after I started burning at 8X...
Never tried their +Rs. I usually use Verbatim, TDK and Memorex +Rs.
It has been a while since I used any.
I did try to buy the 25 pack for $4.99 AR last weekend for the heck of it, but they were sold out when I got to the store (late afternoon Sunday).
Plextor PX-716A TLA0304
Plextor PX-716A same TLA
LiteOn 52246S 52X CD-RW
LiteOn 52246S (another)
LiteOn 52327S 52X CD-RW
TDK 40X USB 2.0 CD-RW
TEAC CD-W540E 40X CD-RW