I developed an experiment on PsychExps with the considerable help of Ken McGraw and his team. Technical support was superb and the experiment works properly. I have since included PsychExps as an extra credit assignment in a class and student feedback was favorable. Although the site doesn't work with all computers (see below), it is easy to use with the right equipment. I think PsychExps has a great deal of potential for enhancing teaching and learning and I recommend it highly.
PsychExps seems to work best with PCs rather than iMacs, and Internet Explorer rather than Netscape. Occasionally, students using IE on a PC will report problems. Although I don't understand why it sometimes doesn't work, Ken McGraw has developed a system for identifying and correcting these problems.