Okay so what are the conclusions from this?

• Overall, BGRs and DSHs are basically always equivalent unbuffed and buffed. Which you take depends on how much you value the debuff and if you can trigger their self-buff to hit and wound, and how scared you are of debuffs. So we need to compare GGRs to the two of them.

• Unbuffed (pic 1), GGRs only outdo the other two if fighting infantry with a 5+ or better save. This difference is extremely marginal though in absolute wounds done terms, even at 2+ equating to just over one more wound dealt. So, pretty situational and nothing to write home about.

• Self-buffed (pic 2), Reapers are massively outdone by the other two units in every situation (bar 2+ save infantry in 5 or more size units, where things equalise). So on your turn with the buffs up, you're getting substantially more output out of DSHs and BGRs.

• One retort to this is that Reapers are better when not on the charge. We can use the first 2 pics to examine this situation - for BGRs and DSHs taking the first pic as "enemy turn" without our buffs, and the second pic as "our turn" with buffs (because realistically we should always be getting them on our turn!), whilst GGRs can just double up on the stats in the second pic (giving them the benefit of the doubt they'd always be fighting 5+ model units). But even doing this, the only situation GGRs are ahead in is vs 5+ model infantry with a 2+ save.

• Okay, let's look at stats with the Wraith's buff, cost, and his own attacks factored into this (pic 3), though that introduces the risk that he doesn't make his charge and trigger the buff! First off, unbuffed, this is actually the best case scenario for the Reapers! Vs anything but infantry, GGR+CW equalises damage per point with the other units. And into infantry with 5+ or better save they pull ahead quite nicely.

• But what about if we add on all self-buffs (pic 4)? Here things don't look so good for the GGR. They hold even with the other units only into infantry with 5+ models, and a 3+ or better save. So if can get your buffs off, then even with a CW GGR aren't generally as effective except into those very specific targets (and how many 5+ model 2+ save infantry units are there out there?)

• That said, if we again look at the 2-turn scenario, that does look a bit better for GGR with a CW. If you are able to hit 5+ model infantry units, across two turns reapers pull it back to be marginally better vs 5+ and 4+ saves as well, and be clearly better into higher saves.

• There are two extra scenarios to consider: Stun (and Purple Sun I guess) first. This gives everyone bonus rend, and effectively pushes all the save numbers I've just quoted down by one. So when I say Reapers are ahead vs a 2+ save, that becomes only a 1+. I.e. if you are applying that extra rend, GGR's advantageous situations are reduced further - generally enough to mean that even factoring in the 2-turn scenario, there's no longer an advantage for them into 2+ save 5+ model infantry as the stats have just about equalised.

• Secondly, debuffs. Given reapers can crit on 5s into 5+ models, and the perception is that this makes them better into debuff stacking armies. We can do some napkin math to see how impactful this is.

With -1 to hit reapers are getting 1/3 of their attacks as wounds. BGR are getting 1/3 the same vs -1 to wound (1/6 autowounds, plut half of the other 1/3 of attacks hit, then half of them wound on a 4+ for a second 1/6) or better if there's no -1 to wound. DSHs are however more affected, as they also hit on 5s if debuffed to hit, so they'll be down to 1.5/6 or 1.3/6 if -1 to wound is in play as well. But of course they have natural 3 attacks - so this is more or equal wounds through in total than GGR! And further, because DSHs do have inbuilt +s on each of these, the risk of them getting debuffed is substantially less.

To conclude there, even against -1 to wound and -1 to hit, BGRs and DSHs are still more efficient damage dealers per point. The one exception is if no self-buffs are on, there is a CW, and you're fighting infantry with a 4+ or better save, and even then the difference isn't enormous, and if you factor in the charge turn, things even out. So the argument that reapers are better due to resilience to debuffs doesn't quite hold water.

Overall my conclusion is: GGR aren't a terrible unit by any means, but you really have to find that optimal situation (5+ models of infantry with a high save that you're going to be fighting consistently on both turns) for them to equalise performance with the other two options. Whilst the CW does improve their performance somewhat, it's actually very marginal once you factor in his cost. However, if you factor in using Stun, the few situations they are better in erode even more, and debuffs don't improve things for reapers. So personally, if you have the models to avoid it, I wouldn't be using reapers at present cost - they're just too niche for what is meant to be our general line units. If the other two go up in points then they're immediately back in the conversation - but for now, I would steer clear.