Here are the main differences between these two machines:

• The Pompei has a larger boiler - 5 liter vs 4.5 litter on the Achille.
• The Achille is plumbed or reservoir, while the Pompei is plumbed only.
• The Achille is a spring lever, while the Pompei is a mechanical lever
• The Achille has a rotary pump to fill the boiler, while the Pompei has no pump and only a thermosyphon to fill the steam boiler.
• The Achille has no burn steam and hot water wands, while the Pompei has traditional wands.
• The Pompei is 20 amp, while the Achille is 15 amp.
• The Achille has a drip tray with an option to plumb, the Pompei is plumbed only.
• The Achille has knob hot water and steam valve controllers, while the Pompei has joystick controls.