I switched to RAW + LJPG about a year ago on my 60D when it finally dawned on me from this forum and elsewhere I really needed to go RAW. I figured the JPG was my 'backup'. I use the JPG for 'quicky' output for printing or emailing, although for email, it has to have less resolution to not exceed email limits on some ISPs. I also found that once I had loaded both to a single folder in my computer, using Windows Photo Viewer, I could easily decide which were keepers and which were losers, and delete both the JPG and the RAW. Then I import the remaining RAW into Lightroom and go from there.
Then I bought a 5D3 on Black Friday (no discounts other than the $200 rebate). Like the OP, I figured RAW to the CF card (freebie Sandisk 16gb 90 mb/sec that came with it from
B&H) and JPG to my slower 45 mb/sec SDHC from my 60D. I was surprised that shooting speed was noticably slowed down compared to the 60D. I don't do any bracketing, or burst shots at all...just quick presses of the shutter release (no back button focus for me, yet). I figured the slower SDHC card was the cause. So I changed the settings to 'auto switch' filling the CF card first, then over to the SDHC. I managed to get 425 shots on the CF card before the switch-over occurred. I then noticed perhaps 1/2 sec delay while rapidly shooting. The cause...the slower 45mb/sec SDHC card!
It took a while for me to realize that the file sizes from the 5D3 were about 25-30% bigger from the 5D3 than the 60D. Duh!! Turns out that shooting at ISO 2500 under low light puts out 32-35mb per RAW image. JPGs in the 6-8mb size. In essence, each shot consumed 40-43mb of space!
Fortunately, one of my Christmas gifts was an Amazon.com gift card. Needless to say, a 95mb/sec Sandisk SDHC is on it's way!
So why do I stay with RAW+JPG? I prefer to make my initial 'keep/no keep' decisions with a full screen image using MS Photoviewer or whatever it's called under Win7. It automatically 'skips over' the RAWs. It's quick to display the next JPG image as well. When I see a loser, I simply click on both the RAW and JPG for that image in the folder, and they're gone. I knock off perhaps 30-40% of the images that way. To me, a single click to see the full-screen image and one click zoom-in to check details is a lot faster than several clicks/drag in Lightroom 4 and a couple more clicks to delete an image on the drive. Note that I put all photos on my Windows SSD drive in My Documents until I am finished with all editing, then move them to the archival 1TB hard drive. As a not yet offsite backed up photo shoot, I keep a full set on a thumb drive in my pocket as well. That way, if I have free time at work, I can make the first pass JPG only deletions at work, then simply 'match' the RAW folder against the JPG folder, and delete unmatched RAWs before going into Lightroom.
Perhaps the first steps of my workflow are a carryover from my JPG only days. I figure why waste time 'fooling around' with a picture I don't know if it's one-of-a-kind-have-to-keep when there may be similar, better ones I haven't seen yet? It works for me.
.. the last day of 2012 
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