PME beings are, as you say, friendly yet businesslike. They are 'designed' to be available as practice for novice magicians, and that is where they are most helpful. As you probably know, this is not the case with many spirits, and mistakes can be costly.

I would not think such spirits are up to the task of initiation, although this would depend on where one is starting from.

Most such spirits want something out of the deal, and if they get what they want then they are more reliable and amicable.

robert