Hi,
HikaShop 2.0 is compatible with Joomla 3.0
Joomla 3.0 includes bootstrap and Joomla 3.0 templates are "responsives". It is a short name for "responsive web design".
en.wikipedia.org/wiki/Responsive_web_design
So, website with Joomla 3.0 and responsive template could be displayed directly (without specific development or modification) in computers, tablets and smartphones.
HikaMarket is compatible with Joomla 3.0 too and would be responsive too.
Our demo website use Joomla 2.5 and does not use a responsive design, so our components (HikaShop, HikaSerial and HikaMarket) does not use the responsive feature.
After that, the demo website is not fully configure with multi-vendors.
The user "demo" have some front-end access, so you can edit products and orders when you are logged with this user.
The multi-vendor would be configured fully in few days, we have to finalize some points before display them through or demo website.
But in the backend you can create a vendor, create a Joomla user and assign him to the vendor to test the features.
Regards,