I don't want to be a downer, but the question of wear is pretty important. The reviews that several people have posted don't really tell us much about these "Washita" stones. A real Washita cuts quickly when freshly abraded, but is harder than a soft Arkansas and will last a good long while before it slows down. It is also more pressure sensitive than other stones--it will cut quickly with a lot of pressure, but produce a fine edge with light pressure. These two characteristics--wear and pressure sensitivity--are likely why Washitas were so prized in the first place. A review of a single sharpening session doesn't tell us much about how these new stones compare.
My guess is that these new "Washitas" are just very coarse Arkansas stones, and have little in common with a true Washita. They certainly don't look like my vintage Washitas.
"For me, chairs and chairmaking are a means to an end. My real goal is to spend my days in a quiet, dustless shop doing hand work on an object that is beautiful, useful and fun to make." --Peter Galbert