For me, it depends on how many slots your build allows for on Defense Set receptive powers. If you can only afford 1 slot, then there are better choices. However, if you can fit it into your build its worth it. There's at least 2 other better choices by default, and it depends on whether the slots are all on the same power or split between many powers (then you have to consider set bonuses, and also other better non-unique options).
Personally, I would slot Shield Wall +Res and LotG +7.5% Rech before the Scaling proc. After that, if I can spare another slot on the same power I'll toss Scaling in.
On Hover specifically, I might first consider other options also before Scaling...+To Hit, KB Prot, ghetto Stealth, Fly adjustments, etc also compete for that slot.
So...context matters.
YMMV.