The fact that Whistler has not introduced a truly new design since coming into existence as a "scanner company" speaks volumes. Perhaps their initial intention was to acquire GRE's assets and move forward. Then they became educated as to how much real R&D costs. Some companies think they can hire two people @ $25 per hour (for example) to do the work of one person @ $50 per hour. This is not something you can cut corners in, and must acquire and maintain the most capable engineers if you are going to succeed.
There have been things they can do to GRE designs that are great: add a keypad where it's needed, add features in software, etc. But that only goes so far and doesn't address where radio communication has gone. At the very least they MUST handle newer protocols and simulcast distortion. If you don't, all that's left is rural America where just about any old radio works any way. They can't restrict their radios to only work with their software, YUCK.
I have always been a GRE guy as is likely obvious from my tag line. But they no longer have a product that works for me. I've tried a couple of their new offerings (such as the TRX-1) and found it to be a huge step backwards from where I already am. I know their models may work for some people, but I doubt that continues to be true. If they plan to successfully be in this business in the long run, they MUST $pend now on development. And honestly, that's scary considering that monitoring public safety radio has always been a "moving target".