I say, it depends on your prior knowledge. Go to a book store (Barns & Noble - Starbuck = if available) skim through a A+ certification book and see if you understand/think you know about the subjects covered. More you know (45% or higher), you might be better off just studying off the books, just because you attend a course doesn't mean that they can make you learn more.
Honestly, w/ the job market as they are now, I honestly don't see the investment of those high $$ courses paying off any time soon unless you plan to open up one of those "high tech schools".

CompTIA changed the exams since I took it but since it's meant for basic (starter) intro into field of technology, I doubt they could make it that difficult.