I've been very happy with the 106. In my area, State Police are using digital P25. There are few digital scanners on the market. The thing about the 106 though is it's the GRE 500 which comes with some needed accessories that you'll pay extra for at Radio Shack like an A/C adapter and computer cable (necessary). I mainly went with the RS version due to time - I needed a scanner faster than I could get the GRE.
In the end it worked out for me because RS put the scanner on sale the day after I bought it and refunded the difference. With the price being $100 less, it didn't matter too much since I got the computer cable $10 off and the a/c adapter at a good price as well.
Before buying the 106, I read up on the Uniden scanners as well. I don't recall why I chose the 106 over the Uniden but there was a good reason.