The wilderness course is good, but emr course might be better
For what it's worth, I teach the St. John Ambulance wilderness course up here in Canada. The problem with any such courses is how much the value depends on the individual instructor. I am sorry to say the quality does vary greatly. The course (when taught properly without shortcuts) is valuable. It covers topics from proper planning to identifying and dealing with an infected wound. This can mean the difference between life and death (you don't learn this in standard first aid). The course I teach involves 3 days and 2 nights in a wilderness setting, and after you have already completed a standard 2 day first aid course.
A better course is the Emergency Medical Responder. This is a two week 9 hours per day course, with 100 hours pre-course study work completed prior to starting the course.
This course teaches you to assess conditions and stabilize the patient far beyond any standard or wilderness course.
If this course is available to you, I would highly recommend it.
By the way, this EMR course in canada is about 600 dollars. A wilderness course plus the required standard course is about 350 dollars. I am a little appalled at the prices you quoted.
Best of luck with what ever you choose to take, and I hope it proves to be worth what ever you end up spending.