I have now been through Zhik, WIP, and now Ride Engine Defender HF impact jackets. The Ride Engine Defender is by far the best vest so far. Not perfect but the best I have used.
With the WIP I tore some rib cartilage on two falls in the same spot where there was not side protection. Real Nick said this is the way to go. Spot on.
Positives:
Ride Engine Defender it has far superior protections.
Fit is excellent, it does not move
Does not ride up
Not a problem on hot summer days
Color is good, but it has faded after 80 days use
Zipper stays in place with simple loop and snap
Negatives:
When wet it gains a lot of weight
No pocket, but easily solved with Spinloc pouch on my harness
Good product and will buy it again.