I have the Evolve, don't think its too different from the Imagine. I have not done a lot with it, but this past week, I used it to do a 3 thread rolled edge for an infinity scarf. It was so nice when completed.
I hesitate to use it because I must get the book out and study it to see what settings I need depending on the project.
This is one of my sewing goals this year, to use and learn my serger more.
Do you have the workbook, not just the little diagram that came with it? The workbook is invaluable to teaching you what does what, and how to do it. YOu may have to ask your baby lock dealer to order it for you, but so worth the money.
Is your friend letting you buy it from her, hopefully she is. also go to the baby lock web site and watch there videos, short but useful.