Congratulations on the purchase. Is this your first L lens? They are addicting, and I agree with you that you shouldn't pick up one of the superteles unless you want to own one... they are incredible. I think you'll find the 70-200 works great with the TC1.4, and gives up some sharpness and AF speed with the TC2. My understanding is the TC2 was really developed for the big whites, but will work with some degradation on the smaller teles. And, if you are really wanting some reach, you can stack them... however, you'll need to shoot manual because one of them won't get reported to the camera. I took these shots last night of the moon with stacked TCs on a 400 f/2.8



And here are a few shots at near dusk last night of our family's go-kart outing.

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Mike - Been Converged?