I have purchased a few times from Softmaker. I use their Office product on several of my PC's [I had the opportunity to buy "One Copy" of MS Office through my employer for like $9.99, but it was only a limit of ONE. Plus, it could only be ONE license; for either a WIN or MAC. I could not buy one of each] So I used the MS Office on my faster, most used PC and Softmaker's office product on my other PCs]
Their mailing list is one of the better ones to be on. From time to time they offer some pretty good discounts on their products.
I haven't conducted any extensive, side-by-side, feature comparison between softmaker office and ms office, but for my basic uses, Software office has been a good product.