I've been looking for such tools for a long time, since Contactually moved to personal CRM to a broker-focus CRM.
Onboarding was easy although I had to switch to the Mac app to complete the LinkedIn integration. I really like the multi-platform play (Max, iOS, web app).
I have only been using it for a few days so I cannot judge the "smart cadence" features and how good Clay is at surfacing connections to nurture.
I have already used it to connect on Twitter with a business contact, without having to know he has a Twitter account. #win
The missing killer feature, and it's a big one, is merge recommendations. Years of import/export of contacts from personal to professional has left me with lots of duplicates and I would pay for an easy way to clean this up. That was one of the good features of Contactually.
