Those memory cards are of crap quality and that kind of thing tends to happen with such.
what a load of rubbish, i have 3 max memory cards and they are nearly 4 years old and still work, backup your hate with facts first before you start spouting.
I have experience with such. I also know this from other people who have used them. But if it makes you feel better, you can join the list of people I've found with no negative experiences with the cards.
JoveHack (GameFAQs PS2 system board)
jalaneme (GBATemp PS2 system board)
Yeah, the list is that short. The problem with such cards is that as 3rd party hardware, they don't have set standards they have to comply to, so they tend to use cheap materials for production. I personally have tried both their PS2 32MB video cards and 2GB ProDuo memory sticks, both have been nothing but problems. The PS2 card would randomly corrupt saves, refuse to save others (mostly Sony and Square games, which have been known to block high capacity memory cards) and then eventually failed completely taking a couple of hundred hours worth of saves. The PSP memory stick was less problematic, but would randomly refuse to be read, the only stick with which I've had such problems on either of my PSPs.