Lithium ion can have over 1000 charge cycles.

Sodium ion which is only really began manufacturing last year is in the thousands of cycles with expected prices to be lower than lithium ion. I'm not an expect by any means but I think that it will replace lithium ion in the grid market.

Both of the batteries can be recycled and reused.

But really to answer in the most fundamental way of what use it is? Well it pays for itself. People are installing these batteries because over the lifetime of the battery they make the owners a profit and that's with lithium ion which really isn't great for grid storage, but it is all we have a scale right now.