I'm really surprised by the lack of reviews for this product, so I wanted to share my experience for anyone considering it.

Why Promo Amp stands out:

People love free stuff, and this tool is perfect for generating leads for whatever you're selling.
The template looks sleek, and creating a giveaway is very easy.
There are many unique ways to enter, including a “spin the wheel” feature, which I haven’t seen in other tools in this space.

Comparisons with other tools:

I also use KickoffLabs, which is nice, but Promo Amp offers better entry limits.
I have Socianomonials too. They offer photo contests and uploads, something Promo Amp currently lacks but has on their public roadmap.

Upcoming features:

Webhooks
Post-entry redirect
Once these features are implemented, I believe Promo Amp will be nearly perfect.

They seem very active in listening to user feedback on their roadmap, which is a great sign for their future development.

Additional highlights:

Their spam protection works well.
The “spin the wheel” feature adds a fun element to picking winners.
Overall, this is a solid product. Do yourself a favor and give Promo Amp a try!