setting ntp with dhcp

hello folks, So DHCP can also be used to set NTP servers on clients, for both IPv4[rfc2132] and IPv6[rfc5908]. I'm looking for statistics on setting NTP servers on clients using DHCP, in the wild. Does anyone know if there is any available somewhere? I'm also looking for reports from operators and their experiences on this, and why they use (or not) this DHCP feature, and what types of networks is this deployed, and their motivations, etc. Thanks in advance, /giovane