I picked up a pair of vintage 451's a while ago, and now I'm thinking about the lollipop capsules. Everything I've read has been very complimentary of the sound of this combo, but in the field taping application I wondered how it would fare. Most of my recordings these days are 2 ambient room mics that are part of a full 24 channel multitrack. So it's not really all that critical to the final mix in the multitrack, but it would be great if the 2 mic tracks could stand nicely by themselves. So far I've read they do very well with a little distance between them and the source, which would make them ideal for stage miking I think...
I posted this on RO as well, so you may see it over there too.
Dirk