I find these disks somewhat pricey even when they go on sale. Also there is a fight going on between TOAST, or DVD2ONE, or DVDRemaster and my iMac's ( late 2009 edition ) burner hardware. There is a 50-50 chance of success and then there is a 50-50 chance of failure. There is a thread about a mile long at Apple's discussions regarding the flaky burner drives Apple stuck in these machines. I have tried Verbatim and Memorex and Sony dual layered disks. Here again sometimes success and sometimes not. Are there DVD plus or minus rewritable DL disks ? There are no such disks available to me in Canada.