About 99% of windows plugins work ok in linux, and most of the plugins that fail are failing on authorization, so with free plugins ratio should be even better. So take a look what free alternatives there is for windows.
I have Ujam Carbon (got it together with something else from pluginboutique), and have to say it doesn't sound like guitar, but synth mimicking metal guitar. For making something guitar-like sounds to some electronic music with metal vibes that would work, for making real metal, forget.
But please report what you find. And what kind of guitar sound you are looking for?