I use two SP B1s to record acoustic guitars, steel and gut, solo and backing, into a Yamaha aw16g. I can understand how everyone has a personal preference for one mic over another, but I find the SP B1 to be an excellent low-cost mic for this purpose. With many years of work in pro studios as a session guitarist, I'm a pretty picky guy, especially with choosing cheap equipment. With careful mic placement and minimal EQ, I'm able to achieve quite a clear, smooth, natural--and very useable sound. For $100 a pop, I've heard nothing I like more. I hope to pick up a couple of 603s, though, for a different flavor.
I've also been waiting for the new (June) SOS mag to hit the stands here--rumor has it that Paul White gives the B1 somewhat of a rave review. Makes sense to me.
Yeah, it's a great mic for the money, but as with everything artistic... tastes differ.
J.