Hypoxico high-altitude-simulation training equipment

This is pretty interesting - it was referred to in a New York Times article today:

As the most versatile and affordable option in the world of altitud..., it is perfect for personal trainer studios, individual homes as well as elite gyms and pro-sports teams. It consists of a hypoxic generator that emits hypoxic air to a breathing mask placed over the user’s nose and mouth.

Its convenient size and mobility allow it to be placed next to any piece of exercise equipment, transforming any workout into an altitude workout!·
small size – requires less than 2ft of floor space
User friendly operation: power switch + mask = altitude
Affordable – a fraction of the cost of the Altitude Chamber
Compatible with high-altitude adapter
115L/min of airflow, adjustable to altitude of 12,000 ft / 3660 m

Anyone have any experience of these?