OK, from the top then
Traditional tablet PCs with WACOM styluses have existed for ages - over 10 years. They use an active digitizer (built into the screen) combined with an inductive stylus, which has a pressure-sensitive tip and does not require a battery. It's the same technology WACOM uses for its separate graphics tablets, which is why the pens are, in many cases, interchangeable - I can use the pen from my graphics tablet for my tablet PC (in this case, a Samsung ATIV Smart PC tablet), for instance. This technology is highly accurate, works across the entire system (due to presenting as a [PS2 or similar] pointing device) and is highly compatible with all existing software. Many Windows and Android devices come with this hardware built in... others (such as Microsoft for their Surface line) have switched to WACOM's main competitor for these products, N-Trig - even more accurate, but require batteries in the pens AFAIK.
iOS devices such as iPads have no such hardware built in - they have a "fat finger" capacitive touch display and no native palm rejection due to the fact that if you turn off the capacitive touchscreen, well, you lose all input - WACOM systems automatically turn off the capacitive touch when the stylus comes within a few centimeters of the digitizer screen, which incidentally also allows hovering over the screen with the stylus as a pointing device. The workaround palm rejection algorithms in these "let's use capacitive touch as a crutch for a stylus" devices and apps are almost always universally horrible. I'm hoping WACOM figured out something better for the product you mentioned, but I kinda doubt it.
The accuracy is also quite horrendous - with most iPad styluses, you wouldn't be much worse off using a hot-dog instead.
Hence the complicated workaround for iOS with Bluetooth (for the pressure sensitivity) and the very slow performance - take a look here for instance: https://www.youtube.com/watch?...
I dunno about you, but while the reviewer keeps talking about fast performance, I'd pretty much be pulling my hair out. That might be because of that Bamboo drawing app on the iPad though, and not because the Bluetooth connection is lagging (although that's a possibility too!).