Actually yeah I've seen those around too. How are SA ABS? I never thought to consider them too strongly.. I guess I would love to find some centered GMKs or any half decent PBTs
SA profile ABS are my favourite keycaps. I have dyesub PBT Cherry profile (from Gateron, Ivan's black on black sets.... four of them

), GMK Cherry profile, DCS profile, but the SA doubleshot sets are the best. Really thick and heavy, nice quality centred doubleshot legends (with large letters) and some great colour schemes in the latest GB's. I don't like the feel of DSA. The small keytops combined with the matte surface don't feel right to me.
SA are usually semi-matte (which is smooth, but not shiny), although they wear pretty quickly to a shine if you use them a lot. Strangely enough, shiny SA feel somehow right, unlike shiny DCS.
There are 3 main profile groupings with SA sets: All Row 3 which is "flat" like DSA, 3-1-2-3-4-3 like PuLSE SA, etc. and 1-1-2-3-4-4 like Jukebox, etc, although all of them have Row 3 Shift keys (we're trying to persuade SP to make Row 4 Shift molds, but it's taking some time).
The set that's spent the most time on my boards is Penumbra (
http://keypuller.com/penumbra-sa/), with Hack'd by Geeks second (nice pics on this page:
https://geekhack.org/index.php?topic=67446.900). Then PuLSE SA (
http://keypuller.com/pulse/), then 1976 (
http://keypuller.com/ninteenseventysix/) and then Nuclear Data Green (
http://keypuller.com/nuclear-data/). I have also ordered Jukebox, Retro SA and Carbon... ahem... I will order Skull Squadron SA if and when Matt3o creates it. So I'm a bit of an SA addict.