This is the best pack of DVD9 disks that I've found on the net so far. I've tried several other sites including eBay, where I found that the seller there was not selling packs, but individual disks for a very high price. I ordered these from here twice so far and have had no problems at all (not yet anyway).
There is one minor thing, but that is with many disks anyway. In this case you cannot really burn more than 7GB at top speed without data curruption, or 7.9GB on 2x or 4x; this also depends on the amount of files being burnt on the disk. Example: you have 6 home videos and several word processed documents, totalling about 30 files, size: 7.9GB. Burn time is 17 minutes at 4x, or 22 minutes on 2x. If however you have thousands of files, e.g. you are a computer science student programming some software, with hundreds of dlls, ocxs etc. Totalling files in thousands. Burn time is slower by about 3 minutes for 2x and 2 minutes for 4x.
I myself have found the disks very useful for my presentation unit (with less files) and computing/programming unit (lots of files, all builds of program with sourcecode, research, analysis etc.).
It's a five star product with decent price for postage/packaging.