What I cannot for the life of me understand are people that are popping up claiming to adhere to the "spirit model" at the exlusion of all else. Most of these folks are practicing in the "old system" paradigm and focused mostly on the Grimoires. While a great deal of this material does indeed deal with the conjuration of spirits, not all of it does. There is a lot of sympathetic magick and folk magick in the Grimoires as well that doesnt work through the agency of demons and angels.
One of the funny things that I have noticed is that spirit model, people often get taught energy work by the spirits they contact. They get told to hold their hands a particular way, and breathe a particular way and visualize various things. Cuz, like it or not all these models have a place, and I cannot for the life of me understand folks that want to promote one above another.
If you are trying to attract something to you or open up opportunities than my suggestion is to summon a spirit, and perhaps give that spirit a leg into your life by linking the conjuration to some sympathetic spellwork like candle burning, powdering, etc. If you are looking to influence the mind of another, than you can summon a spririt to help, but you will be better off if the bulk of your work is working directly on the energy body and mind of the target. If you are trying to heal, than I really recommend a strong energy work regimine linked to physical action like the taking of specially prepared medicine and phycial movements.
Almost every model I have seen people come up with to explain magick has done nothing but limit how they practice magick. By all means folks, think about how these things work, but when you come up with an idea, don't cling to it like its gospel.