I needed an expresscard usb3 for my laptop which is a lenovo x200 tablet pc. Primarily I wanted something that would be slim, I didn't really like how most of the other options looked, the ones which extened beyond the slot itself, plus the big head looked too easy to brake. Well, I found this option, at first I hesitated because it is a non brand product, but after seeing the pictures that essentially showed a lenovo x200 laptop with the card inserted in the expresscard slot, I decided to buy it (it doesn't cost that much anyway). All seems good at first, the package arrived, I opened it up, it contained the card, the cable (which you have to connect to provide enough power to the device) and a mini cd with the drivers. First problem, the x200 tablet does not have a disc drive, second problem, my other laptop has a slot insert drive, meaning I had to go to a friend to read the contents of the disc and copy them to a flash drive. Well this won't be a problem for most of those who buy this device. But the following problems should be considered by everyone:
1) The drivers disc is a manually made one, it contains dozens of different drivers that were randomly found on the internet and copied to the disc, some in zip files, others extraced, others in exe files and etc. a total mess... considering that the majority of the drivers wont work there, I found that only the nec drivers worked (but they were rather old ones, and it still said they are beta drivers...)
2) The card actually barely fits in the express card slot, it actually got stuck there and its almost permanently glued to my laptop now, by trying to get the thing out, I actually broke the little push button next to the expresscard slot, which you press to eject the card, but it is so firmly stuck there that the only way I was able to get the thing out without taking the laptop apart was to plug two usb connectors to the ports on the device that slightly press on them like you would with plyers or scissors and try to pull it out, it actually worked, but I'm guessing that after a few dozen of attempts to pull it out like that I might eventually brake one of the ports.
So, the size is really a problem, one way could be to maybe use some sandpaper or something like that to smoothen the device at the edges so it might come out more easily. OH, and one more thing, this might not neccesarily happen to your laptop, all expresscard slots are slightly different, by fractions of a milimeter.
3) It causes some extra heat in my laptop, well, the system and cpu temperature actually rose by 4-5 degrees (rises to 7-9 if I'm extensively using the usb 3 ports, copying contents from one usb 3 harddrive to another usb3 harddrive). I thought it might be the drivers, so I tried to install new ones that I found on the internet, nec 2.something.somethingagain and . some more number. It didn't really help my heat problem but it did give a little boost to my transfer speeds. I haven't checked how much does it effect battery llife, but I'm guessing I will be loosing 10 to 15 minutes. Reminder, I am leaving the device in my expresscard slot all the time, since its too much trouble tryint to get it out everytime.
Well, the good part is, that it actually works pretty well for a usb3 card, the speeds are nice, I'm getting 65-70MB/s transfer speeds from a usb3 buffalo 3,5 harddrive (with peaks of more sometimes). I'm guessing my internal laptop hard drive is the bottleneck here. Transfer speeds from one usb3 3,5 hdd to a 2,5 usb3 hdd are around 30MB/s for a batch of 12000 olympus raw photo files, which are 10-11MB each. The fact that it is slim also is nice even though some size issues are present.
The extra cable is actually rather long so I tied it together to make it less annoying but I see why it has to be so long, for some large laptops might actually not have a usb port anywhere close to the expresscard slot.
I'm giving it 3 stars overall (objectively), because the issues I presented may not be present on other laptops. If I were to rate the device from my totally subjective point of view, it would get 1.5 stars. A broken expresscard eject button will not fix itself for free you know :/
PS. Sorry for my bad english in some places.