This is a super nifty bit of kit, perfect for small business and agencies.
I have been looking for a good few months for something like this.

Google sheet were getting way too big and cumbersome, you can create charts but they kinda suck.
I tried adding everything to Airtable but it's super expensive to share with your team.
This is great because you can set it to refresh the data every day, AND you can automate daily, weekly or monthly reports to whoever is in your team.

Added bonus:
If works really well with Notion - and it wasn't even me that figured it out.
I shared a dashboard link with one of my clients, and he simply embedded it into -Notion. It is a live link to it will update every day, so we're getting up-to-date data every day with no need to download onto Google Sheets.
The embeds look nifty, and my founder was very very impressed with it.

TL/DR:
- Really great option for almost real-time data dashboard and impressing your clients.
- Works really well with Notion and looks ace.
- Set up automated reports, who doesn't love making their life easier?? :D
- Password protection options and also options to host reports on a custom subdomain if you want - nifty!!
- Help desk very responsive and helpful.

Some downsides:
- I'd like some more filter features in Active Campaign so I can see open and click rates for a particular list. But to be fair I think Oviond is limited by what data they receive from the GET requests.