Large SD Cards

So I use a 64gb card, I had it lying around when I got my camera. I also have a 16gb in my bag. Are there any downsides to using large cards? Ive read different places against using large cards. Any particular reason for this? Is it an all your eggs in one basket thing?

Thats the only downfall I know of to large cards. Shooting Weddings I still use large cards in two cameras so its not a worry. When out and about doing landscapes or vacation I use large cards and just change them out every evening or every other so I dont loose everything.

I would rather have more room on each card then I need vs running out of room.

I think it largely has to do with the speed of accessing a larger card. But as file sizes have grown, so has my estimation of what is a "large" card. With my 30D I was content with 8Gb cards. My 50D was quite happy with 16Gb cards. Now, with my 7DII, I have just ordered a couple on 32Gb cards (one SD and one CF). I also note that very large cards (128Gb and above) seem not to be available in SD but are easy to find in CF. May have to do with the physical capacity of the very small SD format.

^ They now make relately inexpensive ($ per Gb) SD Cards is larger sizes with respectable speed.
http://www.adorama.com​/PNSDX128GU1H.html
http://www.adorama.com​/ILXSD256CB63.html

While have the space in very important, the saying 'all your eggs in one basket' rings true.
I recently swapped my 32Gb SD cards for 64Gb cards. Now I have more than enough space.

In a side note, you CAN format the cards into ExFat and uses the to store other files
in addition to you actively photos, so long as you NEVER format them in the camera itself.

I have many files on my SD card and still have space for 800+ RAW files.

One thing people tent overlook when choose lower cost SD card is the write performance. Take the PNY Performance Elite for example, if you look at the spec carefully, it is the read speed that is up to 95MB/s. there is no mention of write speed anywhere. Being a Class10 card, it needs to write at minimum of 10MB/s. With the relative low cost, I am pretty sure the write performance is on order of 10-15MB/s. Otherwise, they would have spelled it out on the spec. On top of that, this also means the flash used on this card is TLC flash (3 bit per cell), which is generally slower for write (as seen from spec or lack of) and far less reliable than MLC flash (2 bit per cell).

The other example on the previous post is Lexar profession card. The spec says 95MB/s read, 45MB/s write. This card costs 2x more, significant faster. To archieve 45MB/s write, this has to be a MLC (2-bit per cell) flash. TLC base SD is very unlikely, if possible at all to get to 45MB/s write.

While I don't think the write speed matter for a lot of usage, I will still recommend get the Lexar Prof type or equivalent just for reliability from MLC flash

^ Not sure about the MLC build of the cards I posted.
But I can confirm both of the cards write at 60+Mb/s

With my 6D camera and a USB 3.0 Reader they are plenty fast for their price.
I shot about 62Gb in full res Raw in Europe and it didn't take long to copy to my SSD drive.

If a SD is doing 60+ write, it must be a MLC card. Current 2D NAND flash TLC can't do 1/2 of that at 1298GB capacity. With the upcoming 3D NAND, TLC will be able to do that. Lexar, being a subsidiary of Intel-Micro join venture, their 3D NAND isn't ready for mass production yet, not for another 9mon to a year.