As in "not GW or most tournaments" official, right?
Nope, more like by what's written in the books themselves. I'd quote it for ya, but my
FW IA's are packed to move.If you've never looked through one, I can understand why you wouldn't be familiar with it.
I was able to locate my 1st introduction to
FW models, the
GW IA I bought in my
FLGS years ago.
JJ did a nice Intro, talking about how cool tanks were and what not and how they always wanted vehicles and stuff, it wasn't feasible during the
RT days. He talks about what a great job Warwick and Tony, that being Tony Cottrell, who's been at
GW as long as
JJ, did on the models, but there were no rules. 1st step to fix this was the CJ, "but these were unofficial and could only be used with opponent's consent. What was needed were some OFFICIAL RULES"... "this being the case, all that was needed was someone to do all of the donkey work for coming up with the specific rules for each of the vehicles... and that is where good old Warwick came in".
PG 4 states "As noted in the introduction, all of the vehicles in this book can be used in games of
40k as part of an
IG army, even if they are not included in Codex:
IG."
they're mostly on the weak side with big, cool, expensive ($$$ and points) toys ...
So is
GW's online store.
Armored Battle Group isn't very weak. Vet skills to shoot a battlecanon twice in a turn is nothing to turn your nose up at. Granted, that's about the only power list they've made. The rest are hamstrung by the restrictions they lay on the lists...bad doctrines and what not.
Edit to add to Topic:
The siege list is focused more on the big guns than the command squads. They limited specials to make up for the extra (1-4 vs. 1-3) mortars/ Thudd guns in each elite battery.
Though, I do prefer 1-3 weapons and plenty of dropping PHQ special weapons.