I use the double and triple length ones for my giant alpine draws, and they'r great. Awesome texture, not stiff at all, and not too thick to make the alpine draws clunky. I will admit that I generally don't use them for anchors, but that's because I prefer cordellette over all slings.
These are lightweight, tough slings (relative for weight and width). I didn't pay attention to the width description and just looked at the picture before I bought. They look super skinny in the pics, but they're not. If your slings might get draped over rock for toprope setups, go for it, but then you might not need so lightweight and should just use cordelettes or tougher slings. If you're using it for lead, get some 8mm tubular slings instead, much lighter and easier to shorten in a quickdraw. Good for a solid, first bolt or gear placement on lead. I have no idea what “avail. tight one or both ends “ in the description means.
"Good sling, just don't expect all of the same color"
I like these Metolius Spectra Slings, but was disappointed with the various colors of the same size sling. I prefer to have my slings of one length be the same color. Other than this I've got no complaints.