What is the opinion of Reddit about the
HUION Pressure Sensitive Digital Pen for Graphic Drawing Tablet – P68 (Black)?

maybe they are, but they are expensive.
What do you think about this one? (Huion Professional Wireless Graphic Drawing Replacement Tablet Pen – Battery Cell)
https://www.amazon.com/Huion-Professional-Wireless-Graphic-Replacement/dp/B00DOWNWTW/ref=sr_1_111?s=electronics&ie=UTF8&qid=1496975964&sr=1-111&keywords=surface+stylus