Leaving amplifiers on all the time???

Current set-up utilizes a Sunfire Cinema Grand 200x5 amplifier. One of the benefits of Sunfire technology is the fact that even after running the amp all night it never gets any warmer than room temp. This being the case I am wondering if there is really a need to turn the amplifier on and off between listening sessions? Any thoughts on leaving amplifiers on all the time? Any downsides?

Thanks,