Silly question - is multisites for me?

I have 8 clients all who have a (or who will have over next few months) a Wordpress site. There are many similarities between each site , most have Gravity forms plugin, every one has a custom theme.

I signed up to to WPMUDev for a couple of plugins but the more I dig around the more I think that Wordpress Multisites is for me.

How do I know if multisites is for me? Will it save me time in maintenance and starting new sites in the future or am I misunderstanding the fundamentals here?