First of all, sometimes it doesn´t matter when a rubber is released, but what "generation" it belongs to. Imagine each generation having a basic recipe, from which different brands bake different cakes. The newest technology is that of Rasanter (thin topsheet enables even thicker sponge). The new HeXer rubbers do not feature these ULTRAmax sponges. They may be the newest edition of an older recipe. None of this means good or bad, it´s just that the development at ESN (makers of all Tensor rubbers) is by no means linear anymore, there are sideways and updates and what not.
Anyway, the new HeXer rubbers fill the gaps in the Rasanter series very nicely.
HeXer PowerGrip has a 47,5 degree sponge just like Rasanter R47, but plays a little softer overall. In direct comparison, I don´t think you´d miss anything in terms of speed and spin, yet everything is a little easier to achieve. In my opinion, if R47 was a tad too difficult to play, try HeXer PowerGrip.
HeXer Grip is and feels softer with its 45 degree sponge, but it still has enough power, something you´d probably find lacking with R42 which feels way softer. HeXer Grip for sure is no rubber for killer shots from mid-distance, but enables great placement and stability close to the table.