Using a modified version of the BZ rulset Kerio 2.15 passes all stealth scans at both PC Flank and GRC. But, does it offer SPI? I must admit I like Kerio 2.15. In fact, I am leaning toward using that over LnS. It offers things I like; such as time-sensative rules, icon animation and the ability to 'block all' from the taskbar. Is that uswise?