I don't usually post reviews of kits, but this one is an exception. My brother just dropped off my two Wall of Martyrs boxes in my room just now.
First Impression: Holy Fudge, look at the size of that box. Twice the size of the Dark Vengeance/Starter Set boxes and much, much heavier.
Looking in the box and pulling out some sprues I'm surprised at just how much detail is on them. All the plascrete walls are well textured and look like they will take drybrushing superbly. The quality of sculpting is what you would expect from GW, hard to beat. If you don't like GWs skull-laden Grimdark aesthetic then it might not be your thing.
There are a few smooth areas under some of the skeletons due to the limitations of plastic injection that look a bit jarring, shouldn't be too much effort to paint them to look like shadows or whatever but it is the one jarring note in what it is a superb kit. It is indeed fully customisable in layout but it should be easy enough to convert too, being GWs usual hard plastic.
As to value, unmatched in wargaming terrain in my opinion. There is just so much in the box for £100 it's astounding.
5 out of 5 Cadian Corpses.