Run several hundred APX900 radios for facilities maintenance, custodial, and crews that need an IS rated radio but not for use in high noise environments, they only have one microphone. Other get APX4000's model 2 if they do not page other users, and model 3's if they do need paging, just easier to use for paging and directly entering radio numbers. APX4000 has two microphones for high noise areas and IS rated. APX4000 model 3's go to security types, and then APX6000XE for fire. APX900 is our "entry level" radio and appears almost like the Trbo XPR7550e in use at many other locations across the country. Run a combined Astro/Trbo system that is nationwide, and the APX900 build quality is much like the Trbo XPR7550e, and probably has some parts compatibility. PTT and side button failure requires a new case, have had some LCD display problems, and some screws to come out (threadlocker before fielding helps this). Although, even the APX4000 antenna connector has been known to come out (threadlocker needed here too). The APX900 should only be given to those that are gentle with their radios, and use it as an accessory to a cell phone, light users.