It should always be the DJ. I understand if the client has a list of songs to play through out the night but, thats the DJ's job to mix them in...
Technics %100.
Old english
Is Rekordbox compatible with any controller?
If you decide to get the SX2 I would say to consider looking at the Denon controllers before you purchase anything.
Do you find that this works faster?
Atomic was my first.