The Josephsons thoroughly kick ass.
They are my only pair of SDC's, and I couldn't be happier with them. The are fantastic on so many sources, including ac. guitar and drums. I've had great success with them on el. guitar, bass, vocals, room mics, snare, toms, kick, etc. A truly great tool to have around.
Very clear, detailed, crisp sounding mics. They work well at further distances too. The freq. response seems to even out a little more on top by backing the mic up a couple inches further than you might normally... But they still maintain a "close" feel. I guess that's what you'd call "reach".
The build quality is extremely solid. They feel heavy and could certainly take a fall.
The 451s are decent mics as well. I've used them quite a bit as OH's, and always thought they sounded nice in that application. Nice tight polar pattern.
There is a pair at the studio where I assist, which were used as the main OH pair most of the time, but since getting the Josephsons, they've been "riding the pine" more often than not.