I downloaded just the megahit Summer 2012 from Amazon.com and heard. The sum of the songs that would like them on the sampler been more expensive single purchase, so I bought the album. Otherwise, it is as always, some good songs and some less good songs, if the former predominates and the price is right, it's okay.
Much more likely not cost as a sampler album but. The prices of Bravo Hits, TheDome and the rest of them are partially just too high.
Mega Hits Summer 2012 --- my current buy recommendation.