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Each of the games took about 11 minutes to install and required between 6.6 and 6.8GB. It shaved off about nine to 15 seconds off the initial load times. Think it’s worth it?
The article didn't discuss what effects it has on in-game performance, not just loading. The Xbox 360 occasionally suffers from disc reading problems during play as the drive heats up too much, so HDD loading would at least prevent this I think.