Super sculpey is a brand name of polymer clay. (basicly a polymorphic PVC derivative)
Theres nothing wrong with it for details just be patient and let it warm in your hands first stretching and pulling and generally soften it up.
the genious part of it is that you can make much finer details with it, let it bake (under 5min in a 130C or 266-isch F for non metric users) let it cool for a sec and you can continue without risking going butterfingers all up in it or having to wait a couple of days to be on the safe side just to realize its gone all rubbery.
(you know that really cool thing you did yesterday
and then when you did the other side your thumb squished it?
yeah that wont happen no more)
leaving the much more expensive GS for gapping and minor filling and skinning.
and its just as work friendly as hardened GS in terms of post production like reshaping and sanding and separating. I've got both my first test guar finished soon and at least half the zombified beastman chieftan ready (nothings ready in my shop but anyway...) so I'll get a picky up some time today.
What scares people away and what I've been moaning about for like two weeks is that no one tries it
(including me until I was without GS for 2
days and had a bad sculpting itch.)
because its usually used by people without any real experience to lump different colours together to look like a proxy kitten in a flowerpot or a round blob on a hair pin.
Sort of what anyones first attempt at making a mini looks like
EDIT: it's also a great way to cheat sculpting heads and faces (and armour and tendonds and arteries and...):
Take your favourite hero a sheet of aluminium foil and a piece of polymer clay and soften it up good
make a decent storable shape about half an inch deep and then squish his/her face vertically into the putty and remove.
lift the whole sheet without distorting the putty and stick it in the preheated oven.
wait five minutes and now you have your mold, now take your favourite putty and lubricate the mold properly
and et voilà! you have a dozen emote-a-hero!