I've been a happy owner of the original JetBoil for many years now, but recently decided to give this new generation a try. The Sol is two-thirds of the weight of the original, but more importantly, boils water in half the time--saving a lot of fuel. I got to test this stove extensively on a few different mountaineering expeditions and for 9 days on the Wonderland Trail. At altitudes of 5,000? or less, it boils two cups in about a minute. Another upgrade for the new generation is feet for the bottom of the fuel canister, which provide added stability. The Sol is reliable even at moderate altitudes--I've used mine up to 10,000' so far.
The neoprene sleeve is a little too thin, and the handle a little too flimsy, for handling the pot full of boiling water using your bare hands.
Overall, this is a great product that is really easy to use, yet still lighter than just about any stove-plus-pot cooking system out there.