Bathway is one of those ideas. Their concept, and I truly believe their intensions are honourable, is a simple, inexpensive way to convert a bathtub into a shower. How? Call the "tub cutting people". I kid you not:
So what you're doing is ruining a bathtub to have the same sized shower you had before you ruined the bathtub. I suppose there's a benefit by making it easier to enter into the bathtub ... er ... fancy new shower. But honestly is it that difficult to sit on the edge and swing your legs in? Call me suspicious, but what are the chances the Bathway people also own a company that sells replacement bathtubs?
If this seems like a good idea to you, call me. Call any qualified designer. We can help.