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Stock(ish) Obsidian with IS-F tails look pretty slick. IMO the LED tails look cheap, the LEDs aren't wide enough to look OEM. Obviously to each their own, and I don't prefer them. Save up and you won't regret it. I picked up my set of IS-F tails for $350 from the Classifieds. New sets are around $400 including free shipping.
I just installed the LED tails. I think they look great (IMHO). It wasn't a direct plug n play as the plastic female connectors on the outer tail lights were too small for the OEM plug to fit in. All I did was cut off the plastic piece, connect the 3 prongs into the holes, and then wrapped some electrical tape around it. It looks good and even better at night. You can be the judge.