I think whatever qi cultivation you do , some criteria are required which enable you to judge whether you are on the right path . Taoist cultivation , with attainment and upgrade of qi, then Shen , as its main characteristics, does have some unique ones :
1) Feeling of a hot stream of energy arising from body bottom to the head ; ( capable of initializing qi )
2) At some moment, a sudden bright dot/ball appeared in front of you provided that visualization of light is never a way of your practice ; ( proof that certain quality of jing embedded in your qi ; if no light , means deficient jing )
3) 'Jumps ' at the perineum area ; ( gateway to earth '地戶' opened , a place of life and death)
4) A feeling of hollow at the forehead ; ( initial crack open at the gate of heaven '天門' )
4) Self cure ability for many ailments like coldness , small tumor , deterioration of eyesight , poor memory ability , weak digestion ..etc ; ( your qi starts to get some healing power )
5) Although previously you are not that smart, but after practicing qigong, you can now grasp whatever new, strange problems you come across.. ; ( practicing qi gives rise to intelligence, leading to shen.. )
Taoist cultivation ,despite being a strange system of theory alien to most people, is no different from other scientific systems that needs proofs . The main difference is that Taoist one uses our own body which composes of jing and qi , and our mind , as materials and tools for exploration.