If you have ever herd ZZ Top thats what these sound like.Thay are a copy of the pickups in Billy Gibbons '59 Les Paul.And yes thay do sound kinda bright but thats the tone that ZZ top has.So if you are lookin' for warmth I would say the SH-55 Seth Lover pickup's or the 59's would be pretty good.
I think that if you are going for a warm tone the 59's won't be a good option too. I have had one 59' (neck) on the bridge of a Guild S-100 and it was a bright pickup. I know it wasn't the bridge model but i think the experience was good enought to know how the bridge model would have sound.
If you are looking for a warm bridge tone you should look for a "traditional" alnico II humbucker. That is Seth's lovers or Alnico pro for a vintage output or a Custom Custom if you want a higher output.