The ease of use with which they provide all their services for free makes it very user friendly! I like how easy everything was when building my website using them as well; nothing too complicated or hard about anything at this point in time (as far as i know).
There are not many downsides but if there were any then surely those would be minor issues only compared to what we get from other companies who charge us exorbitant amounts just because our project needs more than average resources/time frame etc.. We used EASY BUILDER's helpdesk service during one phase where an issue occurred regarding payment gateway integration between Paypal & Stripe - It took some effort getting through initially due to language barrier however once sorted out things went smoothly afterwords.