I love the SSL-3!!!!
the problem with stock vintage, or vintage type strat pickups in newer guitars, is thin, weak, piercing tone. The SSL3 is an antidote for this, though not the only one.
I believe that Seymour recognized the "weak strat bridge" syndrome, and addressed it with several pickup: the Antiquity Custom, the Antiquity II Custom, the SSL 5 and 6 Customs, the Twangbanger, and the SSL-3 Hot, as well as a Custom Shop model wound to around 9.5k or so.
By the way, the current American Series Fender strat uses a bridge pickup wound to around 7K (I think), and has the mid tone pot wired to the bridge as well.
I love the warmth, punch, and sustain of the SSL-3. I feel that it excels at crunch chords, and others will love the lead tone as well. (I usually prefer the neck for solos.) I feel like the SSL3 gave me two positions I rarely used before - the bridge, and bridge/ mid.
I have two strats with APS-2s neck & mid/ SSL-3 bridge. This is my favorite combo now, although I consider the Antiquities in a class of their own for their complex, "better than vintage" tone.
I did try the Twangbanger briefly, but just felt the SSL-3 Hot was fuller and fatter. I would like to try the SSL-6 Custom some day for the sake of comparison; I just haven't had the chance yet. However, the specs show the SSL-3 has more prominent mids, and I believe that helps the bridge slot.
I got an email from "Slowhand" recently. Here's part of what he wrote:
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Curly,
I bought a SD SSL-3 for the bridge position in my Strat partly because of your enthusiasm for it on the SD boards. GREAT DRIVING TONE! Kicks the front-end of my amp harder but can play clean with less volume. I have Rio Grande Tallboys in the neck and middle and the volume is even across the board ( I was worried about that). It's startling to hear such midrange out of the Strat. I've tried several PU before in the bridge and they were always too bright. This can handle single note leads with ease.
Gene
"SLOWHAND"
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I have clips of the APS/ SSL-3 set on my Lake Placid Blue page, as well as a separate page for the SSL-3 on my site.