I saw the same thing when I was shopping, the tools look the same, listed at different tonnages and had different dies.
It doesn't matter who sells it, what it cost or what the brand is, if it does the job reliably, it's a good tool. I really can't see me making enough crimps with mine to wear it out. ( it did come with a set of O rings if needed)
My vise lives in the basement, has 8 inch jaws and take two of us to move it anymore. Even had I found the plates for crimping it would be a hassle because I'm not taking it to the trailer.