Donor Advised Funds

If any of you guys have Donor Advised Funds, could you tell me who it’s with and why you do/do not like it?

This is the first time I heard about it, but fidelity gives this detail.

https://www.fidelitycharitable.org/philanthropy/what-is-a-donor-advised-fund.shtml

Does anyone here use one? We need to set one up to transfer stock for donations and I’m wondering which one people would recommend.