While I WANT a set of the sleeves ohhhhhhhh so badly, I haven't done so yet.
Reason being, I like to carry a puffy jacket as in camp insulation and for "extra" insulation when sleeping (if needed). I hate the thought of the rare but unfortunate incident of snagging my quilt on a branch, too. Also I don't like having to put my quilt on the hammock when I'm ready to climb into bed - call me lazy!
If I'm really trying to go SUL, then I'll use the quilt as a serape and not carry extra insulation - haven't needed the sleeves for most temps on this type of trip - especially w/ a Driducks jacket over the quilt as it does a great job of trapping the heat. If I was going much below freezing, then I'd probably want the sleeves or my wool armwarmers (lighter, not as warm, cheaper).
All that said, the sleeves are freaking cool! I would love them for the times I want added warmth, and they work well for sleep socks, or so I've heard.
My advice is to buy them, decide you don't like 'em, and sell 'em to me for cheap
! Please report back on what you decide.