PacketTrap does a great job at managing your core network infrastructure and core infrastructure devices. It does a decent job of managing workstations. We use it in conjunction wtih LabTech as LabTech is really good at working with individual devices but doesn't handle the infrastructure or networking devices (routers, switches, etc) well at all...this is where PacketTrap comes in as it and does a stellar job.
PacketTrap's support is amazing and the involvement of support and development in their forum is amazing.
The only reason my ratings aren't all 5s is because of the lack of depth in scripting, deep custom monitoring and device management. To be fair, though, there are only a few other RMMs that do this well and they miss the boat when it comes to infrastructure monitoring.