I like that it has multiple uses.
You can use it to schedule multiple meetings for available time slots. We use this to register for school each new year. The registrar inputs a ton of 15 minute time slots and then you're able to sign up to meet with her.
You can use it to sign up to volunteer in time slots.
You can use it to sign up to bring items.
You can use it to request money for items, like a fundraiser.
You can use it to add events to your calendars.
There's a small problem with the calendar syncing and the time zones. When you sign up on the desktop version the time zone is correct but when you look at the sign up summaries it lists the sign up times in the wrong time zone. That past several times I've sent or received sign ups, it has been necessary to double check the times that you're signing up for vs what it may sync to your calendar because the time zones are off.
As an assistant in a small preschool we rely on a lot of volunteers - time, money, donations, etc. This platform is a great way to reach many people with one step and helps to keep track of items/hours for events. I also volunteer as a room mom at my child's kindergarten. We use the sign up genius all the time. My daughter's teacher will use it to request items for various projects in the classroom. We also used it to request party supplies for our Christmas party.