Bill:
Good luck with those. I hope they prove reliable and long lived. PowerEx have been my best cells over the years. I am still running sets of 2000, 2200 and 2300 mAH with solid reliability.
Lately, I tried some 2500 mAH cells of Energizer and Sanyo brand and suffered failures of rapid self discharge or collapse under load on almost all of them. I am beginning to wonder if there are going to be general reliability problems on higher capacity AA cells.
Also, PowerEx may have extended the warranty to 5 years as a competitive measure against the "name" brands. I don't know of any problems with their cells or reputation that would have forced such a move. A nice feature if we can keep track of all our cells for a long time.
Mark