Result and general impression …
The Icy Dock flexiDOCK MB521SP-B convinced us and lets a little retro charm come up.
With a price of about 25 Euro it is also very affordable. Further plus points are the missing carrier frame, the good workmanship and the different versions. The MB521SP-B tested here can only hold one drive, but with up to 15mm. Who does not need this, gets for almost the same money the MB522SP-B, which can take 2 drives.
Altogether there is nothing negative to report. Who wants to use several 2.5″ drives fast and comfortable can use them with direct SATA connection.