Well.. 1248 owner here. Picked it up within the first few months it hit the market. I've taken every update and not had any complaints. Runs 32 samples in USB and most definitely less with thunderbolt interface. My p/c is relatively up to date.
It has good preamps, and the sound is noticeably superior to my old 828mkII. Noticeably. I really like the web app and the ability to not have to be near the unit to adjust inputs and outputs - they are remotely configurable. I use the onboard compressors during recording, because they sound good.
I agree with everyone that learning routing and mix/submix takes a bit of time but it pays back in spades because it eliminates the need for me to ever have to worry about sample buffer size. I had to use phone support to figure out routing and they took care of my needs same day.
It more than meets my needs, and has done so, not skipping a beat or failing since the day I got it from Sweetwater, knock wood. I love it.
LL