As I was searching for a mixer, I left Presonus AR series due to bad review from users. When I saw the version c, this series has an improved pre-amps. 
 
Mic inputs: 
(+) Clean signal. Even though the input to DAW are pre-fader, once you normalize, there no audible noise from the mixer. (Mic NT2-A) 
(-) The pre fader signal from my condenser is so weak even at maximum gain. I hate turning knob to max. 
 
Guitar input: 
(+) I plug in a bass guitar and the sound is crystal clear compare to the dedicated guitar amp. I love this feature. 
 
Line-in: 
(+) Sound quality is good for the stereo line in 
(-) I connect my FP-30 digital piano and my PSR-S775, both from stereo line-out to different stereo channel. You need to turn the instrument volume to max plus press down the +10dB on the mixer, still the volume is too low. In the DAW, the signal are barely visible. 
 
Super channel: 
(+) useful and good, but for non serious work. 
(+) can be use as an extra channel, but don't expect much 
(-) BT5 connection works well but the noise floor is noticeable. 
 
Other: 
(+) Great build. 
(-) No option to send the signal after fader to DAW 
 
Recommendation: Go for it! I'm satisfied without a regret.