Bless 'em and Godspeed.
But let's remember a couple of things...
Alcock and Brown did this unsupported and on first principles with no back-up, and although flying the Atlantic in a 100mph VFR biplane is no joke sans autopilot about all that remains of a real similarity are the laws of aerodynamics.
These fellas have an airframe built and checked by modern methods and materials which may only be a small but real advantage, but what follows is out of all comparison to the original effort.
They have modern engines, a safety factor probably worth 100 crossings over the originals.
They have GPS nav. They can't get lost. They have comms even if they did...A factor of maybe 10 over A and Brown.
They have modern met forecasts. safety factor, what, 10, over the guesswork of 1920 whenever?
They have EPIRB and modern dinghy/survival gear. International ocean wide recovery agencies now exist. Even if it goes horribly wrong they will be almost certainly be rescued barring incapacitation in the ditching, and even this will be far more survivable with modern harnesses, design, build and knowhow.. A factor of probably a million?
An spectacular stunt I grant you, but risk of an infinitessimal level compared to Alcock and Brown.
Still, wish 'em luck!