Has anyone had success with AI Sales Agents for lead generation?

I’ve worked with multiple lead generation agencies, but the results have always been hit or miss. Some promised great leads but delivered low-quality ones, while others had decent results but were too expensive to scale.

Now, I’m considering trying AI Sales Agents  for outbound outreach, but I’m skeptical. Do they actually work, or is it just another overhyped tech?

If you’ve used one, I’d love to hear:
- What tool did you try?
- How was the lead quality?
- Was it better than using a traditional agency?
- Any major drawbacks I should know before trying?

Would appreciate any real experiences—good or bad!

P.S: Any experience using Agent Frank AI SDR?