I'm guessing the 4x80 / 6x80 stuff isn't killed because their 5x80 / 7x80 successors don't appear to support SMARTNet (at least from a look at the 02/05/2015 Professional Series Price Pages) ?
The 3500 has channel stops. Smaller than 7550, but the same battery. 128 ch max, but how many ch do you need? GARYI've got a fleet of 6550s in a rural public safety setting. Any suggestions for an alternative to the 6550? The 7550 is not good because having channel knob stops is important.