good, but not perfect
wish I knew about this earlier, have wasted many a small fortune buying official Sony 8MBs

fairly large capacity makes it great alternative for back-up and archival purposes if you don't have a dex-drive / AR MAX / PS2 HDD or other means of transferring save data to & from computer hard drive or other data storage devices

have not run into any problems with saving and game compatibility, but honestly have only tested a handful of games
only problem is it that it saves / writes noticeably slower than official / genuine Sony 8MBs
from my estimates about 20 - 60% slower depending on game save size, so a couple of extra seconds every time you save
loading save games has no noticeable difference to genuine Sony 8MBs but when you use the PS2 browser to manage your memory card it takes slightly longer to load

Works great!
I use this for backing up game saves only. Works perfect. No more deleting hard-to-earn game saves to free up space!

Max Memory 64MB
Works great. Backup my all saves with no worries. Price are cheap. Very fast shipping even no shipping charges.

No title
Is the worst memory than exist
Use originals, they give less problems

No complaints
In my (admittedly somewhat limited) experience, this memory card works great. I'm using it for many games (not including the aforementioned WLK or MGS3, however) and I haven't had any problems at all so far. It may not have 100% compatibility, but if you, like me, have an official 8Mb card as well it's not really a big deal.