Can't recommend it for a retail online store.
We propose style packs on our website to be able to easily style HikaShop to meet your needs:
We're actually working on more styles and see if we can include one or two by default for the future.
Regarding usability, we're constantly improving it.
The backend order edition interface has been completely redone with HikaShop 2.2 and next in line is the product edition page and improving the checkout interface.
So be sure to check it back in the future