My verdict: the recruitment niche as a commercial signal.
Mantiks is still young but promising for those who want to exploit recruitment data in their prospecting. Very specific focus on recruitment data.
The tool is still young but promising. UX is a bit weak, but for those who want to exploit recruitment data (job postings, team growth) without the hassle, it's great!
What I like less: the UX that could use some work. The scope limited to recruitment (if you want other data, you need other tools). And the pricing that may seem high for a niche tool.
My advice: test Mantiks if you target growing companies and recruitment signals are relevant to your business. Otherwise, you can scrape job postings yourself with generalist tools.