I have the Innovator 48/96. It's ok, if that's what you have. (I've used worse.) It's not terrible, but yes, mine seems to lock up when using the keypad extensively. If I had the choice, go with the Express.
ETC Customer Support is amazing and will get you through many a tough spot.
Note: I have never used moving lights, but a few people have posted on how the Express(ion) is a bit screwy when programming movers. The Innovator seems to have a strait forward section on movers, at least from reading the manual. But then again, if you're using movers you may want to look into an ION or a
Strand instead of the Express.