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.

I'm currently in a group matched by the service and its working fine for me.

There was a significant delay between signing up and being matched but i am fairly certain that was due to massive demand when it first opened.

The others in my group had no such delay.

If you know other people who might be interested in doing a mastermind group with you it might be better to group with people you know.

In my case it was worth it to use the service, YMMV

Edit: dammit, double spacing