On paper, it looks good.

Solar Beam + Instant Root.
Along with all the other toys, of Boomkins.

They were lacking, healing in a DPS form.
And never lacked AoE power or DPS.
The balance rotation is easily macroable now, as long as you don't take Sunfire (is that still correct, no Sunfire?).

Running four + a healer, removes the no-healing in DPS forms thing.
But you cannot provide support healing, like Shammies.

Still the Silence+Root is a strong addition.