As Kolin notes, a bit of a niche item but it has a use. I've used one of the wider ones for Yates or BW for years. What I've found is that when you're running both 60cm and 120cm slings (loops) over your shoulder, the 120cm can get tangled and a bit of a PITA to deal with. Rabbit runners seem to eliminate some of these cluster issues and there's no chance of loosing the biner which can happen with the loops. No need to have more than one or two though for most things.
Probably not to expensive to make since they already use the material, have bartackers etc. I suppose they just made it because people will buy it and they expect to make more than it costed them to get it rated. I could see replacing a 120cm with one, but I doubt I will...
Congrats BD. You've taken a product that already existed for years, upped the price a little bit, and are currently marketing it as the greatest new thing. Like the Pilot, etc. They've taken marketing to gumbies to a whole new level.
I like rabbit runners in general, however they are made, in winter. I can deploy without taking my hand off the tool, already has the second biner. Can hug a big tree with one, or equalize easily.
I find a couple of those and some draws is enough, ice climbing.
I like nylon runners because I can knot them, they absorb a little energy, and they usually cost less.
Seems to me personally, lots of people compare grams of weight, whole ounces at times, of slings, then carry five lockers and two belay/rappel devices, or two cordelettes.
Mtn Tools has also made these for a long time. They are light and versatile, but some folks don't like the lack of a shelf on top if you use it to build an anchor. The lack of shelf hasn't ever been an issue for my uses.