Hi, l own two Sensations- one M451 this has upgraded caps ( Clarity Caps) and a Furutech aftermarket internal fuse ( and this believe it or not makes a small but worthwhile difference, l also own a M901 this has Russian PIO Caps..... both provide a very nice upgrade from the stock Virtue caps, what PSU do you have, each Virtue PSU presents a different voice..... do some research and enjoy.