Many in favor of HS have had previous experience in music games such as Pump It Up, DrumMania, Guitar Freaks, Dance Dance Revolution, and Beatmania IIDX, all of which have speed modifiers. Speed mods have come to be widely accepted by many players in the music game community and to say to these people that Hyper Speed is cheating would be like starting a fight with an entire (American) football team.
Pro-HS players with no previous music game experience argue that Hyper Speed does not change the notes or the song, and may make songs *harder* by halving the time one has to read the notes.
Additionally, Hyper Speed is the only code that scores can be saved under, and the Guitar Hero ranking site Score Hero accepts scores acheived with Hyper Speed.
Those against HS argue that it makes the game easier, and thus it is grounds for cheating. In addition, when the code for HS is entered, the text "CHEAT ENABLED: HYPER SPEED" pops up--thus, some consider this a cheat in the technical sense. However, others may counter this argument, saying that the "Performance Mode" modifier, which hides the game's HUD and also rings up the "CHEAT ENABLED" text, would also be cheating despite making the game more difficult.
Pro-HS player: "Who cares, I've been using hi-speed codes for years."
Anti-HS player: "Yes it is, I'd rather see someone fail a song on Easy without Hyper Speed than see someone get 5 stars with HS!"