I like Central Water, but I think they're a bit over rated. O'So is probably my favorite Wisconsin brewery after New Glarus.
I'd take the newer Des Moines places over Central Waters. Not saying Central Waters is bad (I do like their beer), but I remember being told that their Illuminator DIPA was better than Abrasive by a guy at a liquor store in Rochester. Not so much, bro. Not so much.
Don't think I've had any O'So yet, have to look into that one.
I agree that Central Waters is overrated, but maybe I've just had so many of the DSM beers that I guess I would still prefer CW to them. Just doesn't seem to be very much drive to make different/semi-unique beers around here yet.
Comparing Illuminator to Abrasive is almost comical. Abrasive is definitely one of my five favorite beers.