I traded there from 1998-2002. David Ellis is a class act and DE/ITG has always been a great firm.
Having said that, please be advised that ALL Chicago firms with the 'traditional' business model have suffered significant upheaval and dislocation, especially as it relates to interest rate futures.
DRW, Ronin, and the old 'Peak-6' have different business models - team approach, smaller splits with discretionary bonuses, more leverage and some OTC abilities.
Bottom Line: You'd better have an edge, and you'd better be able to demonstrate it and quantify it.
I will arrange for Chicago-area interviews for my clients if requested, and will provide detailed references as well as part of my consulting contract.