Mesa Boogie Subway Ultra-Lite 1x15

I've now had some time to try this in combination with a 2x10 cabinet and on its own.
On its own the sound balance is vey smooth and flat (level).
The built in HF driver has a fully adjustable level control and the best position appears to be at the centre point "Normal" as it is labelled.
the High range is stated as -24dB to +24dB.
The LF sound is good and strong - with the slight tail off of the lowest frequencies. The sound is punchy and strong, but may not be quite enough for metal. Every other style should be fine.
The fact that this is deliberately designed to be light weight and portable without causing back injury means that the bass driver has perhaps less dB output than a heavier chassis would have.
In combination with a 2x10 cabinet this thing sits ON TOP! because the cabinet footprint is smaller! The 2x10 is powerful and punchy (as you would expect) but there is certainly more LF response from this Mesa.
I don't think it would be possible to make the design any smaller while still being a loaded bass cabinet.