Dantalion has many abilities that can be used by the occult practitioner. The spirit can be used to understand the secrets of others, to influence their thought processes and also to create emotion. However it's important to understand that these impact free will adversely. Further research I've conducted has resulted in the realisation that a person under the influence of this spirit's will doesn't actually change but just gives the implanted ideas higher consideration.
My experiences with this spirit have shown that it is effective in carrying out tasks. It's abilities when used wisely can effect change in a massive way however it is important to note when approaching spirits such as this caution and the need to stick to procedure is followed.
I used Magick of Influence by Corwin Hargrove to get into contact with the spirit and would advise other practitioners to invest time and effort into obtaining the relevant materials to succeed in their endeavours. (Yes, this means spending money)