I have been using 3D Vista for 3 years now, and absolutely love it! They have a skin which is specifically designed for real estate use, and it looks great on both mobile and desktop. You can view a sample tour that I did here:-
http://www.nickpowellphotography.com/clienttours/360propertydemo/index.htm
I am also a reseller, so am able to offer a €50 discount should anyone still be looking to get it. :)