I have used a spectra for about 2 years now for our cities dispatch frequency. Excellent reception and audio. Was using a kenwood TM-D700, moved that over to ch 2 & 3. The Spectra beats the kenwood by far and blows any of the scanners out of the water. I listen to a simplex VHF system and its the only way that I can hear most of the ht's. Deciding on the spectra depends on the system you want to listen to. I would stay with conventional only. A smartnet system can be monitored with it set to not-affiliate but its not a good idea and if the admin has the site controller send a certain command, your radio will affilate and then will be inhibited turning it into a great paper weight. The only (practical) way to get a radio back that has been inhibited is to have the system administrator of THAT system send the command (from the same console) to wake your radio back up. They will NOT do this for you and will probably file charges for computer tresspassing instead, so is obviously not worth it. Motorola upgraded zone watch several versions ago to check for unauthorized radios on the system, so forget about any smartzone systems. The circle m radios are very limited in their scanning ability, you will get a max of 16 conventional frequencies in the spectra. I have a 18 channel dispatch console that I found on eBay a while back, so I dont really 'scan', all of my radios or scanners are fixed on one particular channel or talk group then routed to the console & voice loggers. Someday im going to clean up all the coax and power cords and take some pictures I would be proud of. You will need a local circle m shop to program your radio with the receive frequencies only, or you can go all out and buy the software, rib and cables required ($800+ if buying from circle M). People claim they wont sell you the software, but I didnt have any problems ordering it myself, just fax a few things back and forth, if you need the number I can dig it up.
Shawn