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I've got a gloss Tune saddle but my de badged seatpost does have a satin finish so I'll see how it looks. Because of the horizontal tt I'm only going to have about 6.5 inches of post showing but it is going directly in to a black seat tube. I had considered it and a guy local to me has a NOS gloss black Tune alloy post for sale right now although he's asking top price for it. I've got a skinny gloss black Sim works stem and gloss black 3t superleggeras. As I'm writing this I'm thinking this really needs a gloss black post now.
I would go full tune as I think the soft mattness of the deda doesn't look quite right and in my head it makes sense to have a different brand bars with tune seatpost/stem than deda kit with 3t bars. for one thing because deda make great bars. edit just seen you have chosen a stem, my bad.