We've been working with PropertyBase for about a year or so now, and the platform has absolutely served its purpose for our real estate org and provided tenfold value. The program is rather intuitive to control in the Lightning Experience side of things, and comes out of the box with a lot of great additional features that Salesforce does not (the Matching Tool for matching Inquiries to Listings, for example). The platform is quite customizable, due to it being made on Salesforce's backend platform. Because Salesforce is the leading CRM tool and has been around the block for a bit, you should have no problem finding solutions or best practices to COMMON problems inside of the software itself.
...However, I gotta say, I'm really quite "meh" about the customer support for PropertyBase. It seems like the response time on inquiries generally is around a day or two (which is quite quick!), but a lot of the support team end up giving generic, link-to-a-help-article responses, and rarely take any additional time to really provide a thorough answer or workaround solution. There is no type of customer support live-chat or number you can call for immediate support - I've found this very unfortunate in times where you're caught in a pinch.
Further, I dislike that certain objects and fields/layouts are "managed" in PropertyBase. This means that, for those specific fields and functions, you have very, very limited control of what you can edit, not even the title (at the very LEAST, we should be able to change the title!). This is far too many fields to count - the workaround is making your own field with the same values, but it causes a headache for regular, non-admin platform users to know which fields to use for reports/list views.