Well I've been running this for a couple of days:
works (more or less) on my Qtek s200 (prophet), WM5, installed onto the main memory
-really does close apps (not like iLauncher)
- coincided with the touchscreen getting misaligned every hour or so

and even the calibration screen froze a couple of times, needing a soft reset.
- inexplicably turned the fonts within SPB Weather black (the name of the cities and the temperatures) - bad news, since my background is black.

All other today screen text was in white, so I could not remedy this, even a reinstall of SPB weather did not resolve it.
The first uninstall of X-Button went really badly, I think because it was still active. So I reinstalled it, deactivated it then uninstalled it again. Even so, 2 files had been left behind by SKtools (taskserStart.exe and taskservice.dll in Windows directory), so I deleted them manually and soft-resetted. Homepage X-button icon gone, and SPB Weather fonts are white again
Now, every device is different due to all the apps we load, but I'm giving it a 3/10 for working but badly messing my phone up!