All the following are generated using Pano2QTVR 1.6.6 Pro Flash

Scene used is Pioneer MRT Station. Click on text or small equi image to launch.

DevalVR (http://www.devalvr.com/)

Very smooth panning. Loading time very good. Small plugin to install, at time of writing, was 262kb.

Flash

Choppy panning.

Quicktime

SPI-V (http://fieldofview.com/spv)