The models I am familiar with are B-ULS, TLII, and EB. The discontinued EB, which is highly regarded, and the TLII, use a capsule that is "based on" (whatever that means) the capsule of the C12, AKG's flagship (read pricey) main vocal mic. The TLII is a transformerless design, biased by design for use as a vocal mic, and opinions are *very* divided on B-ULS vs. TLII. The B-ULS uses a transformer, and I don't know about the EB.
Let me say this, though, I have used both the B-ULS and TLII. I've never gotten to use an EB. Both of the current mics are *great* mics, and either would be a welcome addition to the mic cabinet of either a project or pro studio. In the end, I bought the B-ULS because of price and availability, and it is the go-to
acoustic guitar and instrument mic of this studio, and God, I wish I owned another one. If you want to hear my use of it on acoustic, listen to "Requiem" on the link below. Both guitars were recorded with a single B-ULS on the 12th fret:
www.nowhereradio.com/artists/?aid=3239/album680
My personal preference is for the B-ULS as an instrument mic. I don't find either model particularly useful as a vocal mic for me, but either one can sound *great* on the right vocalist. But if you're looking for a mic to put up on almost anything, the 414 is probably a good choice. It's been used here for acoustic guitar, piano, violin, toms, snare, harp, as an amp mic, and it has shone in all of those roles. The B-ULS is simply the most versatile mic I own.-Richie