Just got this in the mail yesterday from MF as part of my amp consolidation project. Apparently these just came out and they're only producing 500 units. As my attached pictures show, it is tested and signed by Marco De Virgiliis himself! Plugged this into my Bag End S15 w/Carvin speaker which doesn't exactly sound that great with my other amps. I couldn't believe how much open and hi-fi my bass sounded with this amp, even with all of the EQ and filters set flat. I was also surprised how far I could turn up the gain without clipping (this was with an active bass). Super loud with the master volume set at only 8:00! I like how the VLE filter rolls off the highs and makes the amp sound more like my SVT but with all the punch and transient attack of a solid-state setup. I have the new Eden WTX500 on preorder which I'm going to compare with this amp. I have a gig in a couple of weeks that I'm going to A/B both of these amps and then send one of the two back. The bar has been set pretty high already with this Markbass; I know the Eden is more compact and lighter and has a few more features (mute, XLR output gain control, etc.). It will basically come down to which amp performs better in the mix. Hopefully I can post a review soon of the Eden when that arrives. I'm definitely impressed with class D amplification already!