I definitely use 1207 in some situations, but because it only hits a single target I don't find myself using it that frequently. And because I'm a halfling, I definitely tend to knock stuff down anyhow with ordinary attacks. If I were aiming for heads and trying to 1-shot individual creatures, I could see the appeal of 1207 (since I can't reach most creatures' heads anyhow), but I've never really liked aiming my attacks. With 1213 up, I often have the stamina to do a focused mstrike before the cooldown ends, and that usually seems fairly effective. I'm sure I may have to revisit my tactics as I gain levels and the creatures I'm fighting get tougher.
I doubt that increasing armor class with 1202 helps with maneuvers, but I still like having the extra protection for situations where I end up knocked down/immobilized/rt locked/dispelled and my DS drops enough to get hit. Yeah monks tend to have high DS, but there are always situations where your DS can drop precipitously.
This, of course, brings me back to the original purpose of this post, which is to wonder if it'd really be worth it to train stun maneuvers. I guess I'll have to answer that question myself in another 4m exp, since it's starting to look like no one else has really tried it. If only 1205 would work on any of the status effects that really matter