Before Parallax I used to draft my planning with Spreadsheets, the problem with this approach is not matter what you'll always end up doing manual allocations that not only tend to have error but also tend to get outdated as you update other fields.
With Parallax you can always be at ease that every time you update the planning for a team member it'll always update its department. Not only in terms of hours or time as a resource but also to make and have accurate financial projections.
It has been easy to deploy within the organisation, allowing team leads to have more control in their structure and its team, therefore this translates into a more frequent usage as the insights info embedded help to make more smart decisions, therefore, more growth for the company.
As we use Harvest and Hubspot, ease of integration is key for us , thankfully parallax integrates with these two and syncs perfectly with boths platforms in an easy and fast way, so you don't have to worry about coding or troubleshooting to have it up and running.
In terms of support, in a positive way we haven't had to use it much as it flows very well, however in those scenarios where we have a doubt a reach costumer service, we always have a prompt and helpful response,