Hi Ronn,
It might not be what everyone uses but its probably what most people use....I used it, but hey, I'm still trying to get my tower up.....They say on a 1/4 cable the working limit is about 1/4 of the breaking stength...I beleive the working limit is 1200-1600 lbs and a breaking strength of about 6000-7000 lbs.
7x19 cable is fairly common, I would think that about 90% of the folks are using it....but can only guess.
All the best,
Gavin