I have just taken a Kaplan course (at $1000+tx) and it was a joke.
Brilliant teachers with aweful teaching skills. The online material is great though, yet I think there are too many endless workshops and not enough real-life GMAT questions overall. Also, pacing and stress management was NOT a major concern; just one or two quizzes asking YOU how YOU «intend» to manage your stress on exam day, with nerdy tips here and there à la "CHOICE (B) I will panic and try to solve the maths problem no matter how long it must take."! One thing I really didn't appreciate either was the false marketing: supposedly 8 available CATs as means of practice... You see, the way it's conceived, you cannot pause a simulated exam once it's started. As a result, if ever you must stop taking said online CAT halfway for one reason or another, well tough luck you lose one chance out of 8 to practice with GMAT-like questions. Kaplan also promotes its «ULTIMATE TEST-TAKING SCENARIO», which in fact is nothing else than a gimmick i.e. a free take at a real exam at Pearson View, something available & free to anyone at all time anyway!!! For that matter, your best bet would be to go stick to their commercial prep books w/ CD-Rom and CATs so that you AT LEAST get to read them over if you can't finish them (questions, answers & explanations). In other words, bad investment! -> KEEP YOUR MONEY.