it works very well because you have not commited d5, and can attack the knight with d6 when it comes to e5. Also your b7 bishop helps control e4 for one of your knights.
QID vs the d4 systems

If "other d4 systems" includes the Veresov and Tromp, obviously you can't play QID setups against those, but as Assault pointed out, it works well against London and Colle/Stonewall type things.
that's good news. i've been having a little repertoire trouble, especially after 2. Nf3, as i was hoping to play a ragozin after d4 nf6, c4 e6, nf3 d5, but i've found people who play 2. nf3 will play one of these systems avoiding c4 fairly often. i dont really like having my pawn on d5 when playing against them - so maybe i will just cut the ragozin out of my repertoire and focus on the qid after nf3 - whether it comes on move 2 or 3.

Is there any problem with 1.d4 Nf6 2.Nf3 d5? 3.c4 e6 4.Nc3 (4.cd) dc leads to positions you normally play I think. If White doesn't play c4 you still aren't committed to any setup and I think it would be simpler than trying to learn another opening.
i won't be learning a new opening, i've already played the qid a reasonable amount. there is nothing wrong with the line you suggested, but like i said i'd rather not have commited my pawn to d5.

It's all a matter of taste but personally found queen pawn systems more testing after an early e6. For example, 1.d4 Nf6 2Nf3 e6 3Bg5 causes more problems than 1.d4 Nf6 2Nf3 d5 3Bg5 when black can play a quick c5.
i would probably play 3... h6 and then after 4. bh4 b6 5. e3 bb7 6. nbd2 e7 7. c3 c5. i'm not too worried about the bishop taking on f6.

I'm not at all an expert of the Torre, but as far as I know after 1.d4 Nf6 2Nf3 e6 3Bg5 playing c5 followed by Qb6 gives black better chances of getting equal chances than playing in queensIndian style. There is a book by John Cox that recommends how black should play against queen pawn systems when have played an early e6. Personally would check something like that out, rather than trusting a random person on the internet like me.
the line i gave is from opening with black according to karpov, it seems a pretty reasonable way to play. and playing the qid gives me the advantage of being able to be lazy and play it vs d4 with nf3, 1.c4 and sometimes even 1. nf3!

Ok, from what I remembered there was a Yuspov v Karpov game where white punished too early c5 in an Queens Indian style setup, but guess that book of yours avoids that.
For what worth Cox recommends after 4Bh4 d6 waiting for Nd2 before chasing bishop with g5 and Nh5. Leads to more lively but risky play compared to Queens Indian approach.
Ok, from what I remembered there was a Yuspov v Karpov game where white punished too early c5 in an Queens Indian style setup, but guess that book of yours avoids that.
For what worth Cox recommends after 4Bh4 d6 waiting for Nd2 before chasing bishop with g5 and Nh5. Leads to more lively but risky play compared to Queens Indian approach.
thanks for that. i looked into the game you were talking about, in it karpov played c5 immediately on move 3 and the main problem this caused was when yusupov pushed d5 he had to take with the pawn as his knight was still pinned to the queen. i think delaying c5 for a few moves should take the sting out of this idea.

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How well does a qid type of set up work against the colle/london/stone wall and other d4 systems? is it worth investing time into looking at what is most effective against each system, or can i just hope to get a qid type set up and play from there?