They're wonderful pickups. Used one for many years that I put in a MIJ Tele.
Strong bass, nice mids, twangy highs. Classic early 50's Tele tone.
That said, I have to say that the Antiquity I and the Jerry Donahue are my two favorites. Those have more of the tone that certain, very rare early 50's Tele's have. It's a tone with more midrange and that compresses just a little more easily and allows me to shape the tone with the pick and fingers a little more than the Broadcaster.
My '51 Tele had a pickup like I just described. Apparantly so does Jerry Donahue's '52 as Seymour patterned the Jerry Donahue after it. Reminds me a little of a P-90...
But most early Teles have pickups more similar to the Braodcaster or '54: brighter, twangier, etc.
You couldn't go wrong with any of those three: Broadcaster, Antiquity or Jerry Donahue. The JD would be the strongest with the fullest mids, though the Broadcaster might have tighter and deeper bass.
Lew