Yo Stevemac! There are a bunch of designations, but the most common are:
EB, B-ULS, TLII, B-XLS and XLII.
The EB is the older model, and is highly prized if in good condition. It was replaced by B-ULS and TLII. The B-ULS is probably closer to the old EB. The TLII uses a different capsule based on the flagship C12, and is supposedly tuned for vocals. It is identifiable by it's gold grill, and also says B-ULS on the transformer body, because it's the same body as B-ULS.
The B-XLS is new, and replaces B-ULS. XLII replaces TLII. The new models increase to 5 polar patterns, adding wide cardioid, and the pad and bass cuts are now 3 stage. Polar pattern in use is now indicated by LED's.
First of all, all of these mics rock. Opinion is divided on whether the B-ULS or TLII is the better mic. I personally find the B-ULS more versatile, closer to the old EB. I haven't had the opportunity to use the new models, but they have gotten rave reviews, even from people who don't care for the 414. I think this is a good time to pick up a B-ULS, as the new models are pushing the closeout prices of the older models down.
IMHO, the 414 (any of them) are among the most versatile mid-priced studio workhorses on earth. Go out and try to find any major professional studio that doesn't have at least a pair of them. They are a *great* acoustic guitar, mandolin, and banjo mic. They are good on any drum except kick, and particularly good on a really good female singer- a Celine Dion favorite. It isn't the mic I'd put up for a rough singer, or one that's pitchy. It won't cover up anything. I also wouldn't use it on real low frequencies, such as bass. It's a great overhead, very good on piano, strings, woodwinds, whatever you got. There are those who use it as a cab mic, but I'm not one of them. On cabs, I've had better luck with it's cheaper cousin, C2000B.
BTW, I have a B-ULS, and I tracked pretty much all of the
acoustic guitar on a mostly acoustic CD with that one mic. Short of Schoeps, I don't know of a better
acoustic guitar mic at any price..-Richie