verbatim -r 16x!
 

http://www.amazon.co.uk/Verbatim-435...4811068&sr=8-1

are they any good?

100 dvds
at 16x burn speeds
for just £17
and no extra for postage!
(until friday 7th march 08)

cannot be bad, can it?

They are good or OK, just don't burn them at 16X, try 8X or 10X when burning.

Yes.
Burn 4x, 8x or 12x.