Ferrox seems to be ok, less features though.Dev of SEN enabler said that 4.81 has a new certificate and suggested people rather go online with a 4.81 CFW rather than spoofing, if you want to be extra precautious.
Actually I would like to ask what is best CFW alternative aside rebug? I love rebug but I just got a "new" CFW PS3 and I want to setup my PSN account to it and all, for that reason I need newer CFW because I am just that much more precautious about it. Plus I can just install rebug 4.81 when it comes out... IF it comes out.
I remember last time something like this happening that they at least released RebugLITE or something... But now this does not seem to be the case.