Good and happy, but ...

I have the 4TB version now irregularly for a few months in operation. Bin broadly also satisfied and it fulfills its purpose as a small, fast, without power supply, portable storage with plenty of capacity and high security. The advertised WD 230MB / s are not achieved. There are only good 180-190MB / s. That's ok, but 40Mb / s more would have me very happy, because I often copy a lot of large amounts of data.
What also makes a bit of bother and an uncertain impression is that the drive is simply thrown on Mac frequently. That's now happened to me a few times after the Mac has not been used a bit longer and had to start up again the plates. I do not know if the problem on the part of WD can be resolved by a firmware update, but just in my professional field of application a fix this error would give me a much better and safe feeling.
The 4TB version is a bit clunky, what I knew in advance, but it does not so elegant impression as the small version. But this is for technical reasons and known. Unfortunately for me one of the rubber feet has already disappeared, which are very important, otherwise the device wobble and produces noise by no longer damped oscillations. Despite a long and nice phone call I could not Forward feet of DW Support.
What would also have been desirable to use a lighter replacement is the hard drives. Clear would not WD, the user exchanges the plates, but since this device but rather on semiprofessional to professional users is aligned, would be a rapid exchange in a drive failure, a nice feature. I would be interested, such as the performance with two SSDs and whether that would ever be supported in a self-conversion. Although 4TB are well and good, if the price of SSDs but a little fall, I'm playing with the idea of ​​me to build two 1TB SSDs into the housing.