I have used a few of these in the past.... my experience, they are not recovery straps; however, I currently have 2 that have been used a few times on the jeep for simple pulling out usually for when someone is high centered. I have had one fail while pulling out a 79 ford, 3/4 ton on 44's, 460 ci, and a load of heavy extras, it failed because the person doing the pulling took a substantial run at pulling the truck out of mud that was to the top of the hood. The nice thing is that it was a simple break no decapitating whip back, if you happened to be sitting on top of the strap in a bikini you may have had some minor rope burn but would have walked away with all your limbs intact.
for $20 it's not bad to have one, just remember you pay for what you get and a $20 strap is going to have limitations, so use it carefully.