These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fandom Rivalry: X fans for both the 30-year rivalry between Yoshiki and Tommy, and because Tommy's vocal style is pretty much the absolute opposite to Toshi's. Fans of Toshi's more melodic, operatic voice will tend not to find Tommy's stripped down Spoken Word in Music style to their liking and vice versa.
Though in what may be the ultimate case of irony, Firewall Div is the label Toshi is releasing solo music under as of 2015, now that everyone involved is seemingly on good terms again.