Go SanDisk.
I've had Sony ones from completely reliable retailers that were fake unfortunately.
Apparently the situation with fake Sony sticks is very dire indeed.
Got a couple of 4GB Sandisk ones, and an 8GB one (as well as couple of "fake" sony ones). All work fine.
I got mine from a very well known online retailer. Seems legit to me, all works well, using the M33-6 speed hack it goes even faster than before... I couldn't install Resistance Retribution fast enough.... I played it once from the UMD, and then put it on the memory stick, sadly, at the expense of two other games, because it was a full 1.6gb disk. so that's why I wanted a bigger stick. How can you tell if the Sony sticks are fake then? Mine is MagicGate Supported... or are the fake ones too?
If I got a fake one from a legit retailer, I'd send it back, and get a replacement. I have to say though, the Sony one I have here is faster than my sandisk one, but the sandisk one is older, and smaller, which may be why.
Vin.
EDIT: Blimey, just going back through my old orders, I paid £50 for that 8gb Sony Mark 2 about a year ago lol
Lots cheaper now. I was looking on the same store for 16gb sticks. I can only see Sony ones listed. From £71.49 to "new and used" £53, though I'd consider those ones more likely to be fake?
EDIT2: OK, one of the reviews stated
BEWARE the market is flooded with fakes.
The way to tell is the writing on the back of the card should be engraved into the plastic, run your finger over the back, if its smooth its genuine, if you can feel a slight raise then its painted on and fake.
My camcorder just kept saying memory may not be able to record images all the time, very annoying.
THIS ONE IS REAL....AT LAST!!
I just took mine out of the PSP and it feels smooth, so I guess it's OK.
I may see if I can get a 16gb stick from the same source. Or, is it just 8gb sticks that are mainly faked? are 16gb still new enough to be mostly genuine?
EDIT3: and by the way, where I mention above that the Sony stick I have is faster than the Sandisk, that shouldn't be taken as a reason to go for the Sony.... I mean, they're both very fast. The Sony one clinches it, but, it's not necessarily worth spending extra money on. Games still load very fast from both, and make you never want to load from UMD again!