This is a great racket for someone who wants a flexible frame (56-57) stiffness rating, and yet still can deliver power on serves and overheads.
I tried a demo with the new IG designation and honesty can't tell any difference in the frames other than the color scheme. So if you are worried that they stopped making them I think you're in good shape as both the old and new are available. I think the original one is selling for less so I'd opt for that one if you intend to go with this frame. You can get a Demo for $6.95 from Midwestsports.com
Here is the old model on Amazon.