Never in my life have my recordings and song arrangements sound so good at the recording stage
The quality of the apollo unison pre-amps and emulations and also the UAD plugins make arranging songs much easier. In the past I would probably have to record a hundred different instrument parts in order to have an interesting layer of sound, now only one part has enough character to support the song on its own.
The interface is really well built and it's really easy to operate. The console control in the computer can seem daunting at first, but once you get around to it, there's nothing difficult there.
Be careful if you spend a lot of time mixing and moving around because the UAD plugins need the interface DSP chips to work.
All in all, moving to the UAD ecosystem can have its pros and cons (such as the aforementioned dependency on the DSP chips) but since I moved to it my mixes, arrangements and songs sound streets ahead better.