ABSOLUTELY! The Wilton courses are the most cost effective way to get a LOT of basic information and practice. If you get the rare "bad" teacher, simply go to another craft store or see if another instructor is available. For the most part, you will be pleased with the instructors and instruction.
I suggest that EVERYONE take all four courses now available. You will end up spending about $100-$200 for each course over and above the discounted "course fee". The student kit + supplies + lots of tools NOT included in the student kit + ingredients.
You can prepare ahead of time by looking over the links below and purchasing your supplies with craft store coupons. The coupons are only for one regularly priced item/per person/per store/per day. You will ALWAYS have a 40% coupon available, but for the large purchases, wait until you get a 50% coupon.
I recommend you take the courses in order and start by buying the Ultimate Decorating Kit with a 50% coupon:
You can get more information by going to the Wilton.com Discussion Forums and reading threads on the different Course Sites:
For specific information of what will be needed for each class in Course 1:
For what you'll need in the other three courses: