As the owner or past owner of several PRO2006's, I found them to be the best radio of their time. Unfortunately their time has passed and I am now down to a single 2006 kept in the basement at work to quickly pop in a freq for signal checks. (I had a 780 for this but needed an EDACS scanner at home...)
The 2006 might be a good radio for you in your area if you need to listen to aircraft, conventional analog public safety and other non-trunked/non-digital stuff. They are sensitive easy to program and have a fairly large memory capacity.
The problem with the 2006 is that they will not work well or at all with some of the newer technologies in use today, namely trunking, digital and narrowband.
As for trunking, if your area doesn't use it or you have other radios for that then it isn't a big deal. Digital is in the same boat as trunking, you may have this covered with another radio or just don't need it yet.
Narrowband is a whole other story. While the 2006 might work acceptably on narrow channels in your area you may also have issues with adjacent channel interference that is reduced on newer scanners due to tighter front ends and selectable bandwidth. In addition some newer scanners allow use of PL (or even better, PL Lockout!) to help avoid adjacent channel nonsense.