Do you mean hems(the edges of a quilt)?
I believe Tim does rolled hems, or he used to. I do tucked hems, but they're much more time consuming and involve a lot of aggravating ironing with fabrics that don't like to cooperate. Nothing wrong with a rolled hem, it's the easiest option, I just don't favor the look of it, and usually it consumes more fabric (weight) than the tuck option.
A tuck hem (the way I do it) involves top stitching around the perimeter of the quilt 1" from the edge of the fabric first, then ironing open the two layers of that 1" hang, then folding each layer back into the stitch line, leaving you with a half inch on each side with the rough edge folded into the middle. You then have to iron this as well as you can, which will vary in success based on the bias of the fabric, pin them together, and then stitch 1/16 or as close to the edge as you can. Then seals the raw edge into the hem. I usually quickly run past the raw edge with a lighter to seal the fray, although some people use a hot knife to cut the fabric with, which precludes this.
If you actually mean seams, for instance joining two panels of fabric to make a larger panel, then I recommend doing flat-felled seams, as they're strong and down-proof.