i did an in home side by side comparison of the vtl 6.5 / art ref 3 over several days.
http://forum.audiogon.com/cgi-bin/fr.pl?rprea&1182935051
the vtl 7.5 m2 is superior to both the vtl 6.5 and the arc ref 3, but the benefits of the 7.5 m2 may not be as great in your system (over the 6.5) than spending the extra $ on upgrading a different aspect of your system, such as cables or power cords. on the other hand, i do hope to have the 7.5m2 some day, but it is not the next upgrade on my list. the 6.5 has performed flawlessly in my system. also, if you chose a vtl, upgrading the stock tubes to higher quality can greatly enhance overall some aspects of the sound and musical experience .
http://forum.audiogon.com/cgi-bin/fr.pl?rprea&1182935051
the vtl 7.5 m2 is superior to both the vtl 6.5 and the arc ref 3, but the benefits of the 7.5 m2 may not be as great in your system (over the 6.5) than spending the extra $ on upgrading a different aspect of your system, such as cables or power cords. on the other hand, i do hope to have the 7.5m2 some day, but it is not the next upgrade on my list. the 6.5 has performed flawlessly in my system. also, if you chose a vtl, upgrading the stock tubes to higher quality can greatly enhance overall some aspects of the sound and musical experience .