Benefits:
1. Affordable
2. Easy to install (installation as a hard drive + installation of software)
2. No reinstallation of the operating system, as would be necessary for a normal SSD
3. clear speed increase at startup (30 seconds until the desktop has finished loading)
4. All applications often use anywhere start faster.
The whole makes itself but only after 2 to 3 reboots and the one-off load the Progam which one uses noticeable.
Conclusion: So I can use my PC for a few years longer, without the same to buy a completely new. Who as a system disk does not mention his own SSD, might consider buying an SSD cache, even if the PC is new.