One advantage to the traditional SODIS method is the source of the water bottles is generally free. I have used and taught the use of SODIS in Ecuador, where empty water bottles are often strewn along roadways. The new SODIS bottle while likely more efficient, has a price tag and as soon as it costs some money, many of those who would benefit from the product are quickly priced out of ownership. Even if the price were fairly low, distribution will often make a useful product unobtainable in many remote areas.

Pete