The advice from Close Baby says they are better stored in the wet bag that either comes with the kit, or you can buy separately. I suspect it's just a marketing ploy to get you to buy more stuff though . I've stored mine in a bucket to no detriment to the nappy.
I've been trialling them on my 14 mo old DD and agree the outers are very soft and the bamboo quite thirsty but I've had a few leaks if they aren't changed regularly.
The birth to potty option is good as there is obviously a value for money advantage, however, I have had them on the biggest setting with DD (who is still wearing 9-12 mo trousers and dinky with it) and with the booster pad poppered in can barely get them fastened. They are also quite low rise, so definately wouldn't suit a long or chubby toddler. Can't see them lasting to potty training either and I would worry about the velcro fastening holding out for full btp use, let alone use on another baby.
I think if you could buy additional inserts they might be better as then you could change just the inner if the outer wasn't wet or soiled, but I'm not sure that you can. I'm also not convinced that they would contain a newborn poo explosion, but I'll be able to report back on that in November
I think for the cost of them, the quality isn't that great.
There are other snap all-in-ones out there which get good reviews and have lovely soft outers as well, like Itty Bitty D'Lish, Blueberry, Berry Plush, Sugar Peas etc.