This is more of a luxery tool in my mind. I have had a few times where I would have killed to have one, but managed without it.
Most Recently an oil pressure sending switch on a jeep inline 6. Because of the AC lines, there isnt much room to swing a conventional wrench, so it is slight turn, flip the wrench, slight turn, etc...
My biggest problem was that it was a 1 1/16, which does not traditionally come in these sets. Snap On makes one... for $54!!!! I passed on that, and cut a chi-com wrench in half. My boss has an entire box full of flea-market "made in hell" wrenches specifically for this purpose. Just walk to the back, pick the size, modify it and throw it back into the box. Problem solved! Im thinking I will invest in a set, and buy one of those 1inch+ craftsman wrench sets, chop them and mig them together real quick. Something tells me this void's the warranty hehehe, but I cn get the entire set for less than the price of one Snap On.
Jim