I have the Transcend 2gig in my R4DS. I bought it from NewEgg.com
PoR crashes in it easily, but I haven't had an issue with any other game thus far, and I must have ran over 100 through it. Didn't try Tony Hawk, but I'm sure the slowdown is bad, as it is for every card. But like I said, EVERY other game has been perfectly fine.
I figure that if I run across a game I like, and it doesn't run through the R4 properly with the Transcend, I'll just buy that game....or a new microSD for the R4 at that time.
My card reader in my PC will only read at 5megs per second max, but this is what it rated the speed of the 2gig Transcend at using HDtach:
Random access: 1.6ms
CPU utilization: 2%
Average read: 4.8 MB/s
The results were the same whether I used 8 or 32 meg zones in the test. Since it's slower than 5MB/s, it should be accurate. The graph in HDtach showed a straight line, so it doesn't fluctuate while reading.
I have NEVER had the card corrupt or give my any hassles with reading from or writing to it. So I consider it good enough for me.
Hope that's useful to you guys. Go ahead and add that to any lists that may exist for flashcards if you want.