The first word that comes to my mind to describe these batteries is AMAZING.
Amazing because they last much longer (>5x) than any other cheap rechargeable batteries you can buy.
Amazing because they don't cost a fortune for this. You can spare a couple of euros/quids if you buy no-brand or shops branded batteries, but, really, there is just no comparison.
Amazing because, unlike other famous brands I tried, you don't pay their superb performance with a dramatic reduction in terms of maximum number of charging cycles (I'm now around my 70th cycle, I suppose. Other brands didn't go past 20...)
Amazing because they have no dimming in low temperatures. I've waited on purpose after winter to write this review, to be sure that I'd had the occasion to put the batteries under stress during alpine/touring skiing (minimum temperature was -15°C). The amount of photos I could take with the digital camera was really comparable to those in warm conditions and by far higher (10x) that any other rechargeable batteries I have tried, including the ones manufactured from famous brands.
Amazing because the total capacity is not a crazy number written on the package, but it is actually the real delivered performance. These batteries will last much longer than any no/shop-brand battery claiming to be a 3000mAh AA cell :)
The plastic case inside which they are delivered is a nice extra, which I found extremely practical for safe transport inside a backpack.
To put it short: just the best rechargeable batteries on the market!