I've been matched by this service as well. For me, it also took a while to get matched but I knew going into it that there would be a waiting period. (We're not all easy to match, ya know?)

After 9 weeks, half my group quit but customer support was very responsive and my group is now 100% full again.

If you don't have the right people in your network or you don't have time to be "interviewing" a bunch of people to make up your own mastermind group, then a service like this is a no-brainer.