Anyone tried Timo Boll W5?

I wouldn't say that is "understandable." It's a pathetic response from a rep who obviously screams, "I don't care." My and others' dealings with them over the past decade has been the same. 

So, the vendor doesn't know and makes up some BS story about the Chinese copying BTY's paddles! Too funny. It's also fairly obvious that the BTYs don't communicate with each other. Their country's respective websites are all quite different. BTY in Korea had the most elaborate and detailed exposition of their blades. The US site has almost nothing. The descriptions of the blades were like something a middle school student wrote. I remember the Defense 2 was "For Paul Bunyan like defense". WTH is that?! lol. 

Is TB W5 in fact Korbel Speed, only 0.2mm thicker and with different handle?

Most importantly, Korbel has 4 limba plies and ayous core, while TB 5 has 4 koto plies, and kiri core.
While top speed is about the same, properties are very different. Limba wood is soft, elastic, and as result Korbel provides better dwell time and flex at the neck, which is helpful for looping and brushing strokes in particular.
Koto is hard and stiff and less elastic. While top speed is about the same, on soft shots it may appear slower, because it does not have the limba kick and bounciness. The rigidity of Koto provides better control in blocking, short game and away from the table.

Victor is right regarding Korbel (limba-limba-ayous). Korbel Speed should be Korbel with koto outer plys instead of limba (koto-limba-ayous). If TB W5 is indeed koto-limba-kiri, that blade with squared ST handle might be interesting having the same composition as TB ALC without the arylate-carbon layers.