i have guitar rig and i've also just purchased the GTR thingy from PRS/waves.
i also have a fender vibroverb, marshall 1987, gerald webber's tweed bassman, victoria tweed deluxe, THD univalve, fender tweed champ, fender blackface deluxe reverb, GT trio/D75.
not a fan of amplitube or nigel but have gotten very useful results from guitar rig.
the GTR thingy is not so bad. it actually has a fair amount of touch response, which i thought would never be possible w/ an amp sim.
BTW, nile rogers had some pretty huge hits back in the day w/ his band chic as well as producing/playing on records for david bowie, madonna, diana ross, sister sledge, sting, peter gabriel, brian ferry, jeff beck and others as well as winning two grammy awards.
what the hell does he know anyway?