I have a long history with Sound Cue System and have never had any gripes with it beyond human error. About half of the major theatres in Dayton Ohio use SCS at least here and there during a season (Mostly thanks to myself and a sound designer I work with) I was trying to
MIDI to work with our light board at my school and had problems so I posted on the sites forum and the creator of the software responded in a couple hours with a full instruction manual quality tutorial he created for me (He's never even heard of our board, yuck, lehigh, but we went through the manual and extracted screen shots and everything) Alas it never worked it ended up lehigh lied about midi implementation so it was their end. I've tested the midi on my personal board and it's worked flawlessly. I have the professional license and love the software. SCS 10 is in beta right now and it is looking great, I'm beta testing it and it has a lot of cool new features so keep an eye on this product.
P.S. A great tip is when using this software during tech remember to mute the computer BEFORE you play pinball during a long hold so all the directors designers and SM don't hear the start-up noise.