I use it for more than a year.
Before and long ago, I worked on Cubase (atari and mac), vision (opcode mac) protools, Musicmaker (pc, very nice and cheap way) obviously garageband.
I was looking for a Swiss Army knife software capable of editing midi / audio, and I was especially attracted by the richness of the offer plug-in (effects, virtual instruments, loops): 9 DVD if I remember correct. Software Mainstage, Soundtrack Pro are also part of the package.
Currently, you can load any software on the AppStore independently for a very attractive price.

What I like:
- Providing software and richness of sound library
- Ease of use from the earliest uses (I do not know anything about Logic)
- Stability, never crash, it is significant
- Latency ridiculous (even with the integrated sound card in my macbook 2011)
- Mainstage (provided you spend time to configure and you do not make the mistake of charging 10 times the same piano sound without using aliases)

I do not like:
uh ... nothing really annoying
- Arpeggiator that I wanted to use one day for a laugh, this is a little choppy. Logic is for musicians, not the guys who play arpeggios in triplets with a finger.
- I would love to find a nice function Musicmaker (Magix) to assign an effect to a track segment, without activating the full track, but we obviously can easily circumvent the problem.
- Some midi loops completely useless (I do not like working with loops anyway, except for the battery).

Quality / price excellent.
I would do without this choice problem.