Apart from the reduction of electricity usage it is supposed to bring, and the CO2 reduction, (actually a failed argument in times where Airconditioning usage is high), The main advantage is for those living in an Eastern time zone. I allows you to contact those western businesses who would close an hour later in times of Daylight saving, (BUT you require to have rejected in your local state for the benefit to be realised).
Here in Queensland, (Australia), our capital city is on the eastern extremity of the state and so after a decade or two of trialing Daylight savings we rejected in a ballot! During summer the maximum time difference across Australia, (for Queensland residents), is only 1 hour, (+/-), so it brings our country close to being under a single time zone!
The biggest reason, (in jest of course), was that the farmers didn't like it because all of that extra sunlight was fading the curtains!
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The idea behind its economic value is based upon 1960's research but now the power usage actually increases because of daylight savings and not decrease, (as the initial research indicated).
Just a view from downunder!
Have fun!