It's pretty great, not a ton of templates but if you have the time and know how it is right up there with whatsup, solarwinds, etc. You can drop a JPG map in for a background, create a global map showing your datacenters.....your office with the printers....detailed rack layout. Custom groups, monitoring, alerts...SMS, jabbers, premium services. The agent does not require a reboot, it works with Active Directory authentication, there is a trick on getting it to work...but it's easy breezy after that. The inventory is pretty awesome It can keep track of all of your even logs so you can keep them small on the hosts....and memorialize them in Zabbix. It can monitor a website and can actually log in and browse pages for a valid response, aka, user experience instead of is IIS or apache running?
Not suitable for large infrastructure (painfully slow with 10k hosts), web interface is inconsistent (ex: column sorting not always possible) and browsing experience is uneasy (ex: switching from data to configuration without keeping host context), unsecure (any host can pretend being another). The macro system and rules look like nice features but are plagued with numerous bugs, some unresolved for a long time. Should not be used outside domestic testing.