Barrier of Scales: Worth It?

[SynalonEtuul]

Is 60 points of ablative armour for 30 seconds every two minutes especially useful? It looks like it could be good - but is it as good as Daunting Roar? I am also confused as to the exact nature of "ablative protection"; does this work in the same way as stoneskin, but without the 10 point cap on damage prevented?

Thanks.

Edit: Well, this was meant to go in the Epic Destinies forum. Oops!