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!).
That's definitely a big part of it, I've reviewed a few different stylus/tablet solutions (except for some of nicer Android solutions I couldn't easily get my hands on like the note) and part of the problem is the smoothness of the ipad screen and the stylus nib; because it's so very smooth many apps do a lot of interpolation of the data to create more natural lines introducing a noticeable lag. This can be adjusted in some, with the tradeoff of an unnatural writing experience. Some (like the bamboo paper app) can be set to use the bluetooth/stylus exclusively for effective palm rejection which is pretty much a must. Sadly, many ipad applications also don't make much use of the pressure levels provided, perhaps the despite the 1024 levels of the bamboo fineline I have it's too noisy to make good use out of.
Another big issue I've found with the ipad stylus solutions is the accuracy simply because of the parallax due to the thickness of the display stack; where the "ink" appears is too far below the surface. At the surface of the glass the accuracy is pretty solid (imo). I did borrow a surface pro 3 during some of my tests, which gets a lot of things right: very little parallax, a resistance-inducing nib for natural writing and low latency.