I just sold an SC245 that I bought new the first year they were released. It was a great guitar. Very well made and enjoyable to play. On one level I really liked it. On another level it just didn't quite work for me.
I have a Collings 290 and one of the things I discovered is that I like the scale length being a bit longer. On the 24 1/2" SC245 I can't seem to consistently make accurate stretches. When I bought the Collings (24 7/8") I discovered it was easy to hit them. The 245 is a bit too "loose" for me.
The SC245 control layout makes a lot of sense. I really like it. But. . . it's different than my Collings and my Les Paul. I would second guess myself on which knob was really the bridge volume whenever I switched instruments.
The SC245's are weight relieved. Mine had more of an upper mid voice, versus the lower mid voice of my Les Paul. It's attack was also a bit softer, relative to the Les Paul (a heavy 1980). It was a bit more on the "flutey" side, if that makes an sense. I think the weight relieving contributes to all of these characteristics. I've never tried the newer SC58, but I imagine its voicing will be closer to that of a Les Paul.
The SC245 pickups are a bit on the hotter side (for a PAF style PU), with pushed mids. I ended up putting a really low wind humbucker set in my SC245 at the end (RD Pickups P-Zero) and they were actually a really nice match for the guitar. They nicely bring out the lively, bright tone of the instrument. It's that combination that sold the guitar.
Terry.