I know you can't use USE posts and Tune speedneedle saddles together, are the speedneedles campatible with deda blackstick seatposts? Thanks

Yes They are compatible!!
I haven't a photo but with my old bike (Calfee Tetra Pro) I have used this combination.

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Ciao Zauri

I've also seen a photo from a Speedneedle with an extralite post (168g for 27.2*360mm)

Yes. I confirm.
In my new MTB (Trek 9,8) I use this combination. (Extralite post 30,9 / 350mm).

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Ciao Zauri

i am thinking about getting the speedneedle - i would like to start a thread to find out which post its compatible with. or should we continue it here?

anyways i would like to know if it goes well with my campy 03 seatpost? i might upgrade in the future, i was thinking USE, but i guess thats a no go w/speedneedle, right?

i like the schmolke seatpost which would weight 125g for a 27.2/350mm but 250 euros is alot of cash.

anyone have a cheaper alternative, lighter than my campy seatpost but that will also work with the tune speedneedle?