I'm watching them for years. They are from Eastern Europe and started really small (they are not so small nowadays) but they deliver extended (!) features which many other CDNs don't have or like in a 5-10x more expensive premium price range. Also their policy is really relaxed.
Awesome value for the money. You get much more for lower pricing.
I'm using their bulk pricing for video streaming (from a B2 backend). Works great, support is awesome (fast response, credit when issues occur) and the UI is a breath of fresh air. Everything just works exactly as expected. I can't recommend them enough.
I've been using them for several years. Saved our local news startup a boatload compared to CloudFront. What we pay in a year for BunnyCDN would equal one month on CloudFront.
Are they fine?