class 10 cards for cx550
 

which cards perform the best and the most reliable for this camera/32gb

Re: class 10 cards for cx550
 

Class 10 is overkill for any AVCHD camcorder.

Any Class 4 card from a reputable manufacturer such as SanDisk or Transcend will easily handle 24mb/s AVCHD video. In fact, many manufacturers have class 4 cards marketed as "Video" cards.

Unless you're really desperate to save a few minutes when offloading footage to your computer, then don't bother with the class 10 cards. Save some money and get class 4 or class 6 at the most.