The Rebelscum member Wclehmann wrote a short review of these new helmets - it seems they are somehow lower quality than Riddells:
1. They do not remove from the stands. They are stationary.
2. Vader is not the reveal. It is a single piece that, again, does not remove from the stand.
3. C-3PO's eyes do light up and says the phrases when motion activated.
4. The weight seems to be much lighter than the Riddells. Don't know if it is the materials (seem to be made of plastic for sure).
5. All of the electronics are in the base, and the speaker is in the top of the base in the rear.
6. The phrases are the usual ones: "I find your lack of faith disturbing" + others for Vader. And C-3PO gives his probability blurb + others. Good, iconic phrases were chosen. But the sounds seem to be a bit echo-y. A bit hollow. Especially the C-3PO.