Stone mainly depends what you gonna do with granite.
My tanker is a perma Granite/SS, comming from the time LotG's were still cheap i reached 64,5% recharge bonus.
Solo with the new Rage (the -1000% dmg debuff), using only rooted, stone armor and the NRG armor (forgot name) you can fight the majority of most mobs ingame. I was pretty good at farming, Family man was rather easy 
Outside Granite your 'weakness' is rooted. That is the only mezz-protection you can have, yet it gives a full -jump/-fly. The nastly tricky part, if you toggle fly/CJ or sortlike Rooted will drop and you have no protection left. Use it very wisely. Goodside, it gives wonderfull -drain resist. However, the Psi armor is (next to dark and WP) a wonderfull power versus Psi mobs, however i just use a few purple and greens to survive.
SS itself is a very nice allrounder, bit control, nice ST damage and works pretty smooth. 4 ST powers, a ranged that does -fly (wich recently been buffed abit), the handclap (the meeeh power) and my lovely Footstomp. Combine with some epic pool (i took fire) and it can be a decent allrounder.
Reason i went perma Granite (with rock armor/crystal armor as extra's), you have more powerslots for attacks or sortlike. I have both fly and teleport, works good.
50)Sinergy X/(50)Mika.
(50)MaceX/(50)Encore
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After hearing from a few of my friends to give /SS a try, I did. So I went for Stone/SS.
Question is...does anyone have any tips for this set as I'm doubting it a bit? (always doubted /SS)
Also, what is the set's weakness and strengths? (can it tank, herd etc)
Thanks.