The Ultra Fit has a heat problem, the Ultra Flair just gets hot (YMMV), while the plain Ultra is slow esp. for it's large size. The Extreme (assuming you mean CZ80) has no heat problem and I couldn't tell if it is getting hot since it's also enclosed in a big plastic casing which only feels warm to me.
They are different internally. The Ultra Fit and Ultra Flare use a monolithic package integrating the controller, flash memory, support component and internal USB electrical contacts all onto a module that slides into the shell, while the Ultra and Extreme use the more traditional discrete chips on a circuit board with a separate USB connector soldered on.
The Extreme (assuming you mean CZ80) has no heat problem and I couldn't tell if it is getting hot since it's also enclosed in a big plastic casing which only feels warm to me.
^ CZ80 Extreme is my most used flash drive at home (where it stays since it's the largest USB3 model I have, too big for EDC in my already stuffed pants pocket) and I've never had a single problem with it, plugged in 24/7 for over 2 years. I just reached over to feel it and it's not even warm.
Looking at reviews, almost all the reviewers that state it gets a little hot, did not claim it overheats to a problematic level, still gave it 5 stars. Only 13 reviews out of over 2400 even use the word hot, which is about 0.5%:
Received an Ultra Flair 128GB yesterday, continuously wrote dozens of GB to it to test. It did not get more than slightly warm.
I wish it had a metal keyring loop at the back instead of plastic but otherwise I'm liking the form factor and price, though the average large file write speed was only about 32MB/s which is slow compared to large modern flash drives but about average for the tiny ones, in real world multi-GB file copy tests opposed to synthetic benchmarks.
Read was up around 150MB/s as advertised. YMMV, this was on a Renesas uPD720201 chipset USB3 controller that handles the Ultra Extreme at triple that write speed, but Ultra Extreme is also triple the volume in my pocket, too big to EDC IMO.
Comments & Reviews (10)
Highest: $79.99 (Nov 02, 2015)
Current: $25.49
Just the "pretty" case as far as I knew, but since the ultra is fine, there's got to be something else.
They are different internally. The Ultra Fit and Ultra Flare use a monolithic package integrating the controller, flash memory, support component and internal USB electrical contacts all onto a module that slides into the shell, while the Ultra and Extreme use the more traditional discrete chips on a circuit board with a separate USB connector soldered on.
Monolithic examples:
http://www.rflashdata.com/kingston-dtse9-16gb-monolith-usb-data-recovery-ps2251-9983aa892/
http://andrewbirkel.com/6-8-13disassemble-a-mini-flash-drive-sandisk-cruzer-fit/
Traditional Example:
https://thumbs.dreamstime.com/z/open-chip-usb-flash-drive-isolated-white-background-42613458.jpg
http://bensbargains.com/link/sandisk-ultra-flair-128gb-usb-3-0-flash-drive-25-at-amazon-510667/?linkid=0
Oddly it doesn't show up on their current promo code email flyer, unless I overlooked it.
There's also a larger (casing), faster writing Silicon Power 128GB Blaze for same price after a different code ESCENGH46
http://www.newegg.com/Product/Product.aspx?Item=0BD-0095-00070
Many, many owners disagree with that.
Looking at reviews, almost all the reviewers that state it gets a little hot, did not claim it overheats to a problematic level, still gave it 5 stars. Only 13 reviews out of over 2400 even use the word hot, which is about 0.5%:
https://www.amazon.com/SanDisk-Extreme-Transfer-Speeds-SDCZ80-064G-GAM46/product-reviews/B00KT7DOSE/ref=cm_cr_arp_d_viewopt_sr?ie=UTF8&filterByStar=all_stars&showViewpoints=0&pageNumber=1&filterByKeyword=hot
I wish it had a metal keyring loop at the back instead of plastic but otherwise I'm liking the form factor and price, though the average large file write speed was only about 32MB/s which is slow compared to large modern flash drives but about average for the tiny ones, in real world multi-GB file copy tests opposed to synthetic benchmarks.
Read was up around 150MB/s as advertised. YMMV, this was on a Renesas uPD720201 chipset USB3 controller that handles the Ultra Extreme at triple that write speed, but Ultra Extreme is also triple the volume in my pocket, too big to EDC IMO.
Thank you!