My Sandisk Extreme IIIs have been working flawlessly. They're good for 144-150 minutes.

Thanks Adam - that's the sort of feedback I'm looking for. Do you format them in the reader? On the computer? Never?

Some cards come pre-formatted, but the Sandisks need formatting. I do the first format in the reader, as the manual recommends. Then I never re-format, simply "erase all." No issues so far.

What Transcend cards are people using?

Transcend 32GB Extreme 400x CompactFlash Memory Card

Specifications:

Capacity: 32GB
Speed: Read: 90MB/sec (Max) Write: 60MB/sec (Max)
Conforms to CF Type I standards
Supports Ultra DMA mode 0-6*
Support high-end DSLR
CompactFlash 4.1 compliant
Built-in hardware ECC technology for detecting and correcting errors
ATA interface
Low power consumption
Multi-platform compatibility
RoHS compliant


From Transcend 32GB Extreme 400x CompactFlash Memory Card : COMPACT FLASH : Memorybits.co.uk

I also use San Disk cards 32GB but after talking with Sony the state you must use at least a 60mb per second card or it may cause problems. I have formatted my cards in my unit many times and have never had a problem, not have I noticed any dropouts. - theses are the cards I am using - http://www.bhphotovideo.com/c/product/646870-REG/SanDisk_SDCFX_032G_A61_32GB_Extreme_CompactFlash_Memory.html

Anyone tried a 64gb card in the mru hvr1?
 

I have successfully utilized 32gb cards but have some long dance recitals coming up and was thinking of buying a 64gb card?

You'll be going more than 2-1/2 hours without a break? Wow, that is long....

I use 2 Transcend 32gb 400x. They work flawless. I.m thinking to buy 2 more.