For most (all) amps, bridged mode is higher power but lower performance (especially in lower impedance). I would not expect it to be better. It will be higher in watts in bridged but not at the spec’s level at the lower hertz. Just letting you know. Buy as you like. They are nice amps for most applications.
That's not quite right - it increases the V output capability (and hence power) - but the current output remains the same.
Noise level rises slightly when in bridged mode (so I am told - I couldn't tell on mine)
It becomes more sensitive to impedance of the speakers as the impedance is effectively halved - so 4 ohm speakers are seen as 2 ohm... 2 ohm as 1 ohm.
Quite a few well regarded amps, are internally two sets of amps bridged.... it's just another approach to design.
Those designs of course, typically are not great at handling difficult (low) impedance speakers