If you already run a Coteaz list then read this before buying the new codex. I will try to be objective :-D This isn't a full blow by blow review but intended to give existing Inquisitor armies an idea of the changes or new players an overview if they should bother
I run an inquisitor list from the GK codex and bought this. I gotta say I'm massively disappointed and a bit pissed off. Cut and paste rules from GK codex with added fluff that it isn't possible to create from the rules options given. There is nothing new added unit wise, nothing to make the inquisitors unique and special other than their was before. There are even fewer rules named characters than the GK codex too.
Changes from the GK codex
No Stormravens. Replaced with a Valkarie. Thanks for that...
Warlord traits for each of the 3 ordos. The first 3 in each are the same
Changed the priests stats and rules
Added background fluff for more ordos
Only rules for Coteaz and Karamazov
A few tweaks here and there
Yep that really is it...
If you already run a Coteaz list
If you have the GK codex and run a "Coteaz" list then do not buy this codex! It makes things worse for you. No Stormraven as it has been replaced with a Valkarie for example.
Also you can no longer "count as". For example I use a librarians stat line for a psyker to go in Coteaz's own warband as a trusted psyker. I use a dreadnoughts stat line to run a penitent engine. My opponents (even in tourneys) are happy with this as it makes sense. Sure you can do it will your allied attachment but I think then it becomes murkier. Also you'd have to ally with the right army for it to work.
The only major addition is they have buffed the priests to give unit buffs and they are now characters.
If the inquisitor codex doesn't invalidate the gk codex then I'll be still using it.
If the inquisitor codex doesn't invalidate the gk codex then I'll be still using it.
If you want to use Inquisitors as allies to your main army
If you want to run an inquisitor with your main army I don't see what this would add. Even an IG commander can take better stuff than an inquisitor unless you want freaky weird stuff. And as mentioned here there are no invun saves unless you take Terminator armour, and this is only available to one of the 3 inquisitor ordos. Hell, Lord Coteaz of an entire sector can't even get his hands on one! This doesn't make sense fluff wise. These guys are meant to be able to go toe to toe with anything so how do they survive?!
Also unless you convert you're buying finecast models for the elites.
Flagellants are fun but at 15pts a pop they're too much with the new rules when they're going to die to overwatch fire if they make it across the table. Of course you can put them in a Landraider (I do) but it's expensive.
Deathcult asassins for 15pts are better but are one trick ponies who will take out one unit then die to massed fire to the face
The other choices are not worth mentioning. You will have better options for their roles in your own codex
Missed opportunity
Whoever wrote this added background fluff but added no rules to allow for them. The options given simply aren't enough to create a truly special character that an inquisitor should be.
You buy an Ordo Heretic inquisitor and they don't automatically come with preferred enemy of psykers or chaos for example. You have to roll it on the warlord table! Erm... at least include it as a wargear option?
GW really missed a trick here. The free codex with WD way back had the right idea. Unfortunately I no longer have it to reference
In summary. It's a let down. It is a quick money maker in my opinion. Fun if you want to add an inquisitor to your army for fluff purposes but completely pointless otherwise. I think I'll wait for the new IG codex and maybe add an inquisitor with a small warband to it. But £16 to do this is a lot when a 2 page errata to the GK codex could have achieved the same result.