I've had some experience with it, and however useful it may be in determining information and adjusting soundings, I wouldn't recommend it for use in storm chasing. If you're modifying sounding data during the chase for decision making, it's not going to help you that much.
It might help if you really understand what's going on with the data, understand the program, and have some spare time on your hands (i.e. waiting for initiation), but during the chase there's far more important data you should be looking at.
If you can learn how to work with it for the forecasting aspect of chasing...all the power to you. It's an amazing piece of software. You can really learn a lot, just make sure you know the basics to soundings and the atmosphere first.