The upgrade was seamless:
Installation of the new SSDs in the beautiful enclosed housing, connector and the Mac and copy the old SSD. It should be noted that since OSX Yosemite one comes with Command-R in the recovery mode, in which you initialize with the Disk Utility, the new SSD and can be described with the image of the old. In the supplied extremely short brief description which is made even by holding the Alt key while booting.
I have a MacBook then two days externally powered by the new SSD via USB - all without error.
After the exchange: with the included screwdriver can very easily open the MacBook. Replacement of the two outwardly identical SSDs is then very simple.
The MacBook runs since completely free of errors. In rare freezing of the MacBook at very high disk activity under Aperture has not yet occurred with the Transcend SSD. It looks as if it were more reliable than the original.
If still a problem occurs, I will update this review. But according to current knowledge, definitely 5 stars!
