Smaller, lighter, & faster, with plenty of little design upgrades from the previous version. Feels as solid as the previous version, which I've had for 6 yrs of abuse and is still working fine. Heats water much faster, love the added regulator. Inside of the jetboil has graduated marks, along with the cup on the bottom. Cup on the bottom has a twist movement to get it on/off which seems more solid. I've only had it out for a few backpacking trips this summer but so far am super happy with the upgrade.