After 5 years of using Magento, knowband sold me by far the worst software I have ever used. I was actually insulting how bad it was once I started to find all the issues and how incomplete it was.
It was a hacky mess and their support were slow and lacked the required knowledge.
I left a product review on their website and they removed it.
I had to buy a solution from another company as they stopped replying to support tickets when they saw how many issues they sold me for $150.
I feel like I was the first very person to try and use the software. They refused to refund me even when I gave proof I had to buy another solution elsewhere.