I've owned a few but never fired one until today... man was it fun. Dry firing gives the impression that follow up shots would be slow because of the typical long bullpup trigger pull... but that's not the case... trigger resets quickly and you can fire it quite quickly (must be the recoil helping).
The sites are pretty much useless but point aiming is quite natural since the bore lies on your arm... like pointing your finger aiming is easy and relatively accurate...
The 223 out of a short bbl like this is quite loud!
In a word, FUN!