I took a GRE course when I was attending the University of Georgia and was applying to Museum Studies and Art History graduate programs. The course length was six weeks, and I had a really thorough, soft spoken instructor. By taking the course along with completing all of the workbook assignments and practice tests, I was able to do really well on the verbal portions of the exam, while the math portion was still pretty difficult for me (but math has always been my weak spot and I had not taken a math class since freshman year).
In summary, I was really glad I took the course and kept using the books to retake the test for a second go round.
Bottom Line: Yes, I would recommend this to a friend