This is not a marketing or CRM solution, it's a newsletter platform.
You have limited tools at your disposal which means you can focus on writing.
It does nice things like:
- checking your links as you type so you'll never send broken links again
- markdown support
- subscriber tagging
It's free up to 1000 subscribers and the pricing is transparent: $5 per 1k subscribers and an optional $29 "pro" plan if you want a custom domain or to remove branding.