I actually just bought a WD passport 320G.
It loaded up games with CFG usb loader just fine, worked well with WBFS manager 3.0, no no complaints on it's Wii functionality at all.
I returned it after ~3 days.
These were GREAT drives for usb loading, and I guess they still are, but they changed alot about them from the previous versions, and they are now crappy in ways I could not tolerate.
They changed the USB plug to the device to this TINY micro usb, and they did not get their tolerences correct on the slot on the drive... the usb cable would fall out the back of the drive after a few hous use, just from the drive vibration.
Also, they put their own software on the drive, which is normal, but rather then putting it in files on the main partition so we can delete it, they used the firmware to make a "virtual CD" seperate from the main partition which autoruns like a CD insert and causes all kinds of fun issues.
There is no way to get rid of that partition, so you end up with a 290G drive... which is funny because the "cd partition" is only 500meg.
Yes, I know about the differenct between 1000 and 1024 and how the math works out, there is a LOT of these drives missiing for their silly crypto and org software.
Also, when I say there is no way to get rid of it I mean >no way< short of maybe pulling the drive out of the enclosure to bypass the firmware, and then I'm not sure what it would do when put back in. I tried all the usual suspects, windows, Fdisk, DiskDruid, Fparted, nothing clears this silly WD partition. Due to widespread outrage they put out a firmware patch and manager sftware that lets you >hide< the partition, so it does not Automatically autorun every time the drive turns on, but you still cannot access the space used by it.
320G WD drive was ~$80
I returned it and got a 1T seagate desk for ~100. it's externally powered which is causing me some timing issues loading my homebrew from it rather then the SD card, but I'm working on that, and I have three times the space for backups for $20 more.
Mainly, I just refuse to reward WD for the godawful mess they made of what WAS a very nice drive line.