From the engines, it looks like a waste of money. Back end doesn't look stealthy at all. It may reduce the radar signature quite a bit, but from the looks of the back itself, it'll show much more dar than the F22.
Mighty scientific analysis.
Stealth is way over-rated. I doubt there is a fighter pilot out there that would give 1 degree per second instantaneous turn rate for an RCS .01% less.
Stealth is applicable to only two arenas, at least to advantageous use.
One, is a deep strike mission and only at night.
The other, at BVR on known targets.
Since BVR range attacks are pretty much completely out the window in a non-sterile, fluid combat environment where you have to worry constantly about fratricide , a fighter with stealth is pretty much damned useless. Stealth gives modern air to air combat nothing that proficient NOE flying doesn't. Even IFF transponders don't allow for the effective implementation of BVR tactics.
Hinging any fighter's effectiveness solely on its stealth is damned dangerous, when a fighter's mission is not to be invisible.
This is exactly why the AF is looking at cheap, maneuverable drones with a couple of AIM-9x's on them. If you can buy 40 of them for one F22....you can afford to lose a lot, and put them up front, with the Raptors behind.