I believe that Duncans site is incorrect on the differences. Iirc that the classic way of determining differences is the number of s-video and component inputs. V(1) has 2 video inputs, v2 has 4 svideo inputs and v3 has component inputs. Firmware is largely upward compatible so is not a definitive test although it can give an indication of minimum version.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).