Pros: I purchased these from another etailer. I have used them with many many different drives. I just picked up the Samsung 1TB 840 EVO and the speeds are close to 400MB/s. just under for write and over for reads. With my old SATA II Seagates I get 90MB/s so I can't complain. I also use a Seagate Constellation, and several 3.5" drives with them. I have abotu 4 or 5 of them now. I found the USB3.0 micro B connector to be troublesome for me so I have been using these rather than purchasing drive cases, since I can't find a 2.5" case that uses the full size USB 3.0 B connector. The website says MAC not supported, but I only have 2 Macbook Pro Retinas and it works great with both.

Cons: The power supply takes up a huge amount of space on a power strip. The shape of the adaptor is just inconvenient at best. I do not know why adapters shaped this way even exist anymore. I prefer the edison plug to be sideways and the adapter body to be thin enough to plug an entire strip full of these. In fact I have several 3.5" drives and I have to use multiple strips with 2 adapters each, maybe 3 will fit, and that is a hassle.

Overall Review: Worth every cent. For those that wrote negative reviews I think you got a defective unit or you can blame windows. Windows sucks. I spent 12 years being frustrated by windows before moving back to mac OS. I only wish Mac OS could run by default on my windows machines. They would be useful again.

Pros: I am about to buy a pair of these.

Cons: None so far, it's not here yet.

Overall Review: Reading the reviews it seems there is some confusion. The MicroSD to SD adapter is comes with is just a pin to pin micro size to full size adapter. The reason these people below can't read the card in their readers is because there card readers don't read SDHC. I'd say if you are ignorant, don't post a review, it just confuses a bunch of other newbs. I'll update my review after I've played with it a bit.