I have no programming experience at all — thus, I could not tell you about the cleanliness of the worthiness of the code itself — but I can tell you about the problems I’ve found.
For example, parts of the tool which cannot be translated. Also, it’s somehow screwed greatly with my SEO, as Google thinks now that I have bunches of duplicated content because the tool is somehow generating three different URLs with the same report: one in English, one in Spanish, and… one extra URL all out of the blue.
The design part of the tool isn’t too bad in my opinion, the customizability isn’t either. As you can see in https://aglaya.biz/herramienta-seo/, I’ve been able to customize some good 90% of the platform, which doesn’t seem bad to me at all.
Precisely, lacking experience in programming kind of enables me to speak freely about the documentation. The so-called “instructions” of the tool are not quite detailed, deep or insightful. Besides, they’re kind of obsolete in some aspects. It took me a lot of additional research learning how to set up the tool properly.
But, hey, the Customer Support is not so bad. It is not so good either, though. I mean, I am not asking for nobody like me “at the other end of the line” able (and delighted) to write 4,000 words in a couple hours — there you have, my expertise — to communicate something that could’ve been easily said in maybe 400, but that doesn’t mean that I want to ask up to three times the very same question to keep getting the very same three-words answers. Suffice to say that communication is key nowadays. I didn't pay for customer support — just taking the few months that the regular purchase of the tool entails —, but I would regret greatly having done it.
So my recommendations to the author of this tool is to get a tad better at communicating thru email and also to renew the instructions of the tool insightfully. My recommendations to future buyers is simple: if I've been able to set it up with, anyone can.