I purchased the exam prep package for the Cisco 640-864 exam (CCDA) on 4.10.2012. The web site claims a money back guarantee if you don't pass the related exam within 180 days of ordering their material. I studied the exam, scoring in the 960 range (out of a possible score of 1000) consistently for two weeks. I took the exam 4.30.2012 and failed with a score of 708.
I contacted Vincent at the prep website (pass-guaranteed.com) via email that day, and scheduled another exam. I explained that there are some issues with the material: 1) Many misspellings & grammar errors. 2) Some inconsistencies in the answers. 3) And several repeat questions.
I studied the material again, again scoring consistently in the 960 range - then retook the exam on 5.07.2012 failing with a score of 760.
At that point I started emailing Vincent for either one of two things: Give me a refund, or vouchers for a retest. He said he would give me vouchers for a retest (which at this writing I still have not seen). He also stated he is working on a re-write of the material. After 3 weeks I received the re-write of the material.
The new material was better in that most of the spelling and grammar errors were gone, and they had added supporting information. HOWEVER, there were now many questions with different answers than the last set of questions. I asked Vincent about this and he questioned whether I was correct. At that point, I sent him an outline of ALL questions: 1) Had different answers than before. 2) Repeat questions. There were 21 questions in all, and out of them several were on the actual CCDA exam.
I've sent Vincent several emails asking for a full refund per their policy, I even made it easy and gave him a deadline - which he ignored.
Bottom line is this: The material I've seen is unprofessionally put together with many spelling and grammar errors. The first set of exam material did not come with support material to prove the answers - that only came after the 'update'. The support I've received has been less than stellar. I get a few emails a week, mostly with no substance, and I've yet to see a refund.
This company claims to be the best in the business (which is highly unlikely). If in fact, they think they are and want to stay in front of the pack - they are going to have to start performing as such.
Do not use this company unless you have in mind to blow your money.