Advantages of Class 4 vs. Class 2 micro SDHC cards?

SanDisk MP3 players Sansa® Fuze™
1

Is there any “read” advantages of the Class 4 over the Class 2?  In other words, will the Class 4 ensure more trouble-free playbacks of video than the Class 2?  Or is the speed rating pretty much just relative to moving data on or off the card when transferring files?

Thanks.

2

Imo it is not a good idea to use class 2 cards for video. The chances of issues occuring when playing video are much higher for class 2 cards than for class 4 or class 6 cards. Class 2 cards would be okay for mp3 or wma music though. Unless the price difference is huge, I suggest that you get class 4 or class 6 cards instead. Some class 4 or class 6 cards are quite inexpensive now.