I suppose you could say in "More than a Flash" not only that its 100% Sony not some cheap imitation.
Price wise they are very very competitive, Jessops and others wanted nearly twice as much.
I will certainly be using them again and would unreservedly recommend others to use them as well.
However, given that you can only get 256MB or more (reliably) on a Pro, then does the job, if rather more slowly than I had hoped.