I have. I did an inplace upgrade and all went well. I have exchange, SQL, tons of SNMP, and ping monitors and i didnt have an issue with any of them...at least that i can tell so far.
I do not use any WMI monitors so i can answer for that.
Taking the plunge from 9.5.0 SP4 TO 10 tomorrow. Any suggestions prior to starting? I have seen references to truncating tables but not sure how or where to do that.