It brings up so many questions. Why would you want a CF stem that doesn't look like it's CF at all, but instead a copy of the cheap 4-bolt stem that comes on every entry-level bike out there? Why would you want a stem that comes in at 140g for a 90mm, which is actually ridiculously overweight? The 90mm Pro XCR stem I use weighs barely 100g, and it's full aluminum.

A stem is for fit. So long as the construction is correct, the cosmetics are a minor concern at best.