Absolute must have for an iPad Pro. The 12 watt charger that came with my 12.9" iPad Pro is completely insufficient. Not only would charging the iPad often take more than 4 hours. When using the iPad even for light email or web browsing, the 12 watt charger could not stop battery drain and eventual shut off.
The 29 watt charger makes the iPad Pro truly useful. A full charge is very fast - incredibly fast. And it quickly 'tops off' the iPad when in use.
Apple should have included this charger with the iPad Pro (at least the 12.9" model). It is outrageous to spend over $1,000 on a tablet, plus Apple Pencil, plus case/keyboard and be given the totally inadequate and frankly useless 12 watt charger. With this charger and needed USB C charging cable, it adds almost another $75 to the iPad Pro purchase price.