I was curious enough to research a few more links.

There's a long thread about here: http://andrewskurka.com/2012/biolite-campstove-review/ The initial criticism is based on the specs, not on usage, and points out that you can carry a lot of fuel and spare batteries for the weight. The comments include some actual experience, both positive and negative. One chap couldn't get it to work with damp wood, and then its internal battery went flat. I have to wonder how well it will perform when that battery has aged 10 years.

There's a negative review here: http://sectionhiker.com/biolite-campstove-the-substance-beyond-the-hype/ where he found it took 2 hours to get only a 50% charge, and that it needed quite a lot of fuel and attention.

An alternative is the PowerPot, at http://www.thepowerpot.com/powerpot-v. That's not a stove; instead it works with whatever stove (and hence fuel source) you have. It provides a similar charge rate.

I'm interested in this stuff because I'm in the UK, where sunlight for solar panels is often in short supply.