As we are running more online stores we are using more different themes. For the last one ( www.shop.si ) we choose Electro. At the beginning we were a bit confused as they use some different approach, but within a week we fell in love with it. It is full of features, clear code, great solutions. As we have more than 100.000 (600.000 variants) products in our store filters are very important. I contacted Arenatheme support and their response were quick and professional. All our request was done within few days.
We will definitely use this theme for some more stores and I deeply recommend it.