Bought and tried a few integrations and it worked without any problems. We didn't have any tool that was able to sync data from WP to other SaaS. Yes, mostly forms are synced, but you also have webhooks (inbound, outbound). If you're missing any integrations, they even support Zappier and Pabbly. Now you might say why not use Zappier? Because it costs a lot :D
The good part is that they support a lot of mature tools but also some from our LTD "shelf" :D Could be used in the "near future" when we stack more LTDs :D The only limitation for us was that you have to add your API and a secret key. It would be much better if we could just log in to the apps via 1 click instead of adding login to the app, create API, hand it over to Sperse etc. It just takes a lot of time....Other than that I'm happy with. And talks about server cost I'll keep you updated next month...