After looking at the site, it's not Word Perfect . . . it's Kingsoft. However, nowhere in the "ad" does it say anything about the apps being Kingsoft . . . so, so, so easily confused for Word Perfect!
I've used it in the past and it didn't measure up, but I'm sure it's better now.
Again, though, it seems that Office for Android is also free, so why not? I already have experience with Microsoft Office from way, way, way back, and it's everything I need, even for Android.