aoe immob is a bad idea with ice, slick is your signature power and you will have mobs flopping all over the place perma when properly slotted, the aoe immob in the ice set will prevent the knockdown of ice slick and the mobs will all turn and shoot you.
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Its your fault
Its your computers fault
Its your ISPs fault
Yes it will negate the effect of Ice Slick but if your in a decent team with a herding brute and some sort of toggle Corr (say a /Rad), then that AoE immob is much more usefull. Not to mention that there are alot of flying mobs in CoV who just float over that slick and suddenly your left with zero control 
Take it but be wary of when using it and accept its not going to be a much used power (on a level up build I'd leave it nearer 30).
Thanks for the answer(s)! Yes, when on a steamrolling team with a good Brute and Corruptors I wish I had the AoE immob when Ice Slick is recharging 
although Arctic Air with 1 slow in it does pretty good aswell.
Psychic Scream and Shiver however, those sit in my tray completely unused and I would change them into anything even slightly more useful, say, Medicine Pool or Leadership. Leadership would stack well with those of Masterminds and would open me two powers on which I could slot LoTG in (Maneuvers/Vengeance) to get perma-Domination.
Heya, been brainstorming with a new respec build lately ever since I got PSW, even with just 1 slot it's impressive and it has changed my playstyle drastically. Because PSW is such a great attack alone, I don't need Psychic Scream anymore, really, due to it's rather long animation time and repositioning yourself.
Here's my build right at the moment.
1) Psionic Dart
1) Block of Ice
2) Mind Probe
4) Chillblain - could be replaced with AoE immob
6) Arctic Air
8) Shiver
10)Hurdle
12)Ice Slick
14)Combat Jumping
16)Health
18)Super Jump
20)Stamina
22)Drain Psyche
24)Acrobatics
26)Glacier
28)Subdue
30)Hasten (yup I got it that late!)
32)Jack Frost
35)Psychic Scream
38)Psychic Shockwave
Powers marked with red are ones I'm not too sure about. 2 free power picks (can open the 4th Power Pool too)
Note that I'm aiming for the 45-50 content, and tools that help against mobs such as Malta and KoA would be appreciated.