When a reservation pops up that I want through MW, if I click on the link within seconds (literally seconds of the notification) I'm probably able to book about 75% of those reservations. I have less luck with MD / Touring Plans - even when I click in the same "within seconds".
I typically subscribe to MW for 1 month ($19) and it will continuously search for 5 restaurants/dining packages at a time (multiple days and meal times)... once I have what I want at one place, I can deactivate that alert and add another. Then I cancel my MW subscription (can cancel at anytime). For me, it's worth the $19 to snag those hard-to-get-reservations.
Our trips are usually only 2-4 days so the 60+10 doesn't usually get us what we are hoping for at 5:30/6 a.m. when reservations open for our window.
With MW, I've been able to get every reservation we have been wanting for a trip (and usually at the time we wanted) including: Chef Mickey's, Candlelight Processional Dining, Cinderella's Royal Table, O'hana, Crystal Palace, Tusker House, Beaches & Cream, Toppolino's, Liberty Tree Tavern, etc.
Some trips I don't buy it, and just search a lot the week right before we go because things do open up. But if I am traveling with a group and we want what we want - and want to be done with planning, $19 works for me.