Thanks for the review, it confirms typically the same 25-30% improvement in fuel consumption that I have found for gas burners of a medium heat output such as the MSR pocket rocket. I have found that slightly higher efficiency (by comparison) is available using the 1.7 litre pot with gas burners with much higher output such as the Coleman F1 Power stove, which will produce almost twice the heat output of the MSR pocket Rocket. Using conventional pans with the Coleman F1 at the maximum heat output tends to send a lot of the heat up and around the pan, where as the Primus Eta Power seems to 'capture' the heat much more effectively giving boil times less than 1 minute for 0.5 litre of water.
Typically if you can get around 12 Litres of Boiling water with a conventional SS pan and an 220 gm cartridge the 25% improvement in efficiency will get an you an extra 3.75 Litres giving almost 16 Litres in total. Thats equivalent to an extra day or two in cooking capability out in the wilderness all for an extra 40 grams of heat exchanger.
With the larger 500 gm cartridge the differences are even greater giving an extra 3-4 days extra cooking/boiling capability.
The 1 Ltr Etapower pot is certainly appears to be lot more expensive to purchase since they initially appeared on the market though. The Etapower 1.2 Litre pot is available for much less cost though.
http://www.amazon.com/Primus-Eta-PackLite-Litre-Colander/dp/B003EM75EK/ref=pd_sbs_sg_5Rather than spending around $58 for the 1 Litre Etapot I would spend the extra $15 and get the EtaPacklite stove system instead.
http://www.amazon.com/Primus-354083-PACK...155&sr=1-15http://www.youtube.com/watch?v=JF-TxE20m9c