Question [Q] boot manager? multi roms?

Hi XDAers

I have a question about the custom roms

I found as app called boot manger to flash multi roms without replacing the old one!
So did anyone tried it on XZ? It is worked? It is REAL? It is install the rom WITHOUT PROBLEMS?

Thanks!
THATS FROM MY XPERIA™ Z
With:

Android 4.4.2
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