I've had a little time to listen to the newly installed Triton v3 and, summarising, it makes my Meridian setup sound *extremely* musical.
What first drew me to Meridian was the warm, addictive sound of the A500 alongside their 568 CD player. This is a personal view, but, over the past 20+ years, I feel each Meridian upgrade I've made has had an Intel-like tick tock cycle between sounding accurate (as in sounding closer to real-life) and sounding engaging (yet with the accuracy of the previous generation).
The 818v3 seems to me to be part of the former (accuracy) part of the lifecycle and the Triton v3 effectively moves the sound on another generation, sounding even more lifelike, adding more depth to the performance - along with the addictive quality I like so much.
To my mind, the Triton v2 to v3 upgrade is perhaps as much of a game changer as the Meridian 818v2 to v3 (on 7200SE speakers). If you own a previous generation Triton, this is a no-brainer. If you don't already own one then definitely take a look at either the Triton or Denali, as I really believe this is one of the best upgrades you can make.