Office 365 Mailbox Export to PST - Third Party Tools: What’s Your Experience?

I've worked with native and third-party tools in environments from 200 to 45,000 Mailboxes. 

MS Tools are okay for small export batches, but they can be slow. 

Third-party SaaS solutions are better, but you also have cost implications to factor in on top of your 365 licences, etc...   

We currently use a SaaS backup solution that is targeted to our 365 Tenant and puts everything in AWS3. From there, we can query the data and export it in bulk to the same or different locations.  

It's very rare that we have to perform a mass export, but the option is there. 

We rely on MS data. Which is not advisable, but we know we have a backup.  

We have a replica/backup of our data in our SaaS Backup Solution in a different geo location that we can restore to. 

It's not the speed I am worried about so much. 

I am more concerned about making sure that we actually have something to export.