Install instructions are good if you are not a novice with linux, however, one line could be added (in section 4) which would clear up a confusing setup. On the "Enable X Windows On PiScreen" page there should be a line requiring people to use chmod on the "xinput_calibrator_pointercal.sh", which is downloaded, to include execution. If this is not done you will be stuck at a login screen until you fix it. One other suggestion would be to indicate that the "Force X windows to Load to PiScreen Automatically on boot" is not needed for Debian Jessie installations. inittab does not even exist or used in that installation.
This product couldn't be better for the price. The touchscreen works very well and, combined with a battery, it turns my Raspberry Pi into a great handheld retro gaming device. Questions were answered within a few hours and delivery from Australia to the UK only took 7 days. Excellent product from an excellent company. I would definitely buy from them again in the future.