I took modules to Dave back in 2011 that became a BE and an HBE and here are my impressions/thoughts.
The BE is similar to a 70's two input Marshall JMP 2203/2204 but it's brighter, the mids are in a different place and it has approximately 25% more gain that a stock Marshall. It's cool and definitely has more of a "Modern" sound. But if you're looking for the "Back in Black" tone, the EQ won't get you there, unlike an SG MK22, which can nail it.
The HBE, IMO, has too much gain and sounds overly compressed. The tone stack might be the same as the BE but it reacts differently due to the gain structure and compression. It's definitely more of a modified Marshall than the BE, IMO, although with a Floyd Rose guitar and a H949 harmonizer (or similar), it could nail the VH 5150 tone, which I consider buzzy and compressed.