Here's my take. Often we ask the impossible from our tools. Let's say we're working in the rust belt, on a 10 year old car. we're replacing brake lines and are having problems getting the old lines off. We didn't use any penetrant, just through the wrench on there, stood on it, and then proceeded to trace its family linage because, it slipped rounding the fitting. Then we have to get creative with heat and vise grips.
My point is even Snap on wrenches fail depending on the environment you're working in.
I never had a problem with the old raised panel Craftsman flare wrenches but, rust isn't an issue for me and spray the **** out of fittings with PB Blaster
The older SK made Craftsman Professional full polished flare wrenches were ok. I didn't like that they are zero offset, a little on the bulky side, and shorter than the raised panel variety. SK does make 15 degree offset flare wrenches but, they weren't rebadged as Craftsman.
The current PRC made full polished Craftsman flare wrenches are nicely finished, have a decent length, and offset ends. I have the Gearwrench versions that I got on buy one get one special for like $35. I think for normal use, they would be fine.
There's a common perception here that unless a wrench says Snap on, the open end will spread if you just look at it hard.
I have snap on, cornwell, and Mac line wrenches along with Gearwrench. They all serve me well. Often technique and tool use are as important as the chosen tool.
