I have mostly positive things to say about BD.
I'm a former web dev so am used to getting elbow deep into code but for this project, I wanted something that works without a big learning curve. For my business, I realised that others in my niche (not necessarily the most tech-literate) were already using BD, which definitely helped persuade me to part with some money.
Second, the flexibility of BD is great, without it becoming overkill with options. Yes, the trade-off is that if you're a designer or developer, functionality or design may feel restrictive, but for something 'out of the box' that works and doesn't require eleventy-billion hours to setup and tweak, I'm not arguing. As a way of getting a project off the ground and running, it's great.
So, why 4 not 5 tacos?
I know customer service is inundated with AppSumo enquiries but I emailed with a very specific list of features I did want, along with particular questions. I got a relatively generic reply back, rather than something addressing my queries. Thankfully, the wording used in the reply gave me a hint as to what I actually needed to search the documentation for, and found it myself. However, had there not been comments about the quality of customer support, I might have been less inclined to purchase.
The other part of the taco deduction is that the sites can be slow. I noticed this when using two different BD sites prior to exploring the AppSumo offer. I haven't yet explored whether using CloudFlare or a similar service on top of BD would help solve this, but it's on my to do list, as if it catches my attention, it might also be noticed by my customers/clients.