My experience with Zencart is overall okay.
What do you like best?
Easy to start. Easy to setup and customise.
What do you dislike?
I like to follow the established brands, like Flipkart, Amazon... I like their flow during a purchase and how they engage customers to purchase a product. Apart from technical aspect, I also see from business aspect, i.e., I just not like to build a ecommerce, I like to build a ecommerce that will convert in a brand later... So, looking from this perspective, I find some limitations.
Recommendations to others considering the product:
I am not in a position to give suggestion to other users. I am also exploring it... Beside exploring, I love to develop. So, when I think of a new feature, I automatically try to build that in a HMVC module, so that I can re-use that anywhere.
What problems are you solving with the product? What benefits have you realized?
For small budget projects I use Zencart. That saves my time and effort.