Totally worth the subscription if you suffer from upgrade waitlist anxiety- or even to preplan to avoid the waitlist! I am an elementary level user but have found the alert system easy to set up. I am also starting to use the fare tool to pull fares on obscure routes that the airline search function can't (or won't) find; means a call to the TA, but has also saved me big $$ to JNB and DXB on *A.