Honestly, they can be useful but mostly just dress up what TikTok Studio already gives you for free, just with fancier wording. The real value kicks in if you're posting high volume and need to spot patterns across 50+ videos that you'd miss doing it manually.
Save your money until you've actually got enough data for the tool to work with - if you're under 30-40 videos posted, the "analysis" is just generic advice you could've Googled yourself, lol.