It may be rated as Class 6 by PQI but it may not write as fast as you expect. From what I've read on many forums, it seems that for many manufacturers the class/speed rating applies only to read speed.
If PQI is using the same oem supplier of electronics as OCZ then it may be an issue as I have run into OCZ cards that only meet their rating on read speed but not write.
And so have others...
- navigate to Tests\by Cards\SDHC
Just found this...
- see the 1/26/2008 review; 3.3Mb/s write speed
If you have a good quality card reader you can check the write speed yourself.
Use this software - ATTO v2.02
I downloaded my copy from here... http://kb.ciprico.com/lore/article.php?id=268
Example of of one of my tests:
I'm pretty sure that the read speed here was limited by the USB bus. Probably could have been higher if I'd used a good quality Firewire800 or eSATA reader.