It's a great program, but the small latency between hitting Space and a Spot FX Cue makes it very difficult to use for young sound operators (latency isn't there with other media players).
Multiplay is fantastic. There were literally no restrictions on what I wanted to have happen with the complicated plot for a show I directed. Side by side comparison with Multiplay and an expensive program used by a local theatre group proved that Multiplay is equally powerful, with no compromise. David Duffy, the brilliant creator of the program, promptly answered questions I had as a newbie when I was first trying Multiplay out. If you need sophisticated sound play back for a play, you couldn't do better than to use this program.