I also forgot to share some important details about Presonus Studio One and especially the compressor that comes with it:
Studio One offers very easy-to-use sidechaining capabilities. As soon as you insert the compressor into a plugin slot (which is simply done by dragging it from the plugin browser either on the track in the arrange window or the according channel of the mixer resulting in immediate opening of the plugin GUI) you can route any other channel via aux to the sidechain of the compressor.
If you use the internal sidechain you get a lopass and a hipass filter that can be used to shape the sidechain signal to prevent the main signal from pumping especially through its low frequency content (kick drum and bassline normally).
That, the continiously variable knee characteristics and its transparent sound make S1's comp a true mastering tool IMHO.
Same with the EQ that comes with S1 (especially in High Quality mode).
I have never come across such a easy-to-use sound application before. If you are familiar with the Steinberg family of programs (the guys from Kristallabs who wrote S1 have also been the creators of Cubase SX and Nuendo before AFAIK) or Apple Logic (I know both) it is very easy to switch.
And no, I am not getting paid by Presonus to write this - I am only convinced through the practical use of Studio One.

Joerg aka GoldenEars Sound Balance Engineering aka fUNKYpUNK tafka RasJacko
PS. Being a longtime reggae-/dub-head I also like the name of the app. Studio One was also the name of the Jamaican studio where most of the classic ska tunes have been recorded, the basslines of which are getting used in reggae music to this day: Studio One Riddims.
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"Give me, for my life,
all lives,
give me all the pain
of everyone,
I'm going to turn it into hope.
Give me
all the joys,
even the most secret,
because otherwise
how will these things be known?
I have to tell them,
give me
the labors
of everyday,
for that's what I sing"
—
Pablo Neruda