A good tool to help in the questions it asks.
The test engine is broken however. It has multiple choice buttons where you clearly need to select more than one answer, yet can only choose one. Some questions are totally wrong, so verify each wrong answer you get from the test engine before you count it or commit it to memory for the CCNA.
It is good in helping you understand the type of questions you will encounter, from CLI, to move boxes around, to type out the answers. (Spelling does count and I have been told it does on the CCNA as well.) The fact that if you type "router" and it wants "routers" is just wrong and messed up. Many questions have been missed because I typed "Spanning-tree" and it wanted "Spanning-tree protocol". Note it will not take STP either. IMHO: A serious flaw in Cisco's testing and this flash card kit. One note I recommend. Hand Write all your flash cards. Don't rely on the print outs. You will have better retention.
For the money, it is worth a buy. It is helpful in orienting you to the new 607 test format. If nothing else, it forces you to double check your wrong answers. Just don't count on it to be totally accurate and don't let it's flawed low test scores discourage you.