gap between tines is greater than the PocketRocket
a slightly longer set-up than the PocketRocket
Spent canisters create more waste
I used the MSR PocketRocket for 10 years until the Micro peaked my interest because of its more compact size. I gave my old rocket to a friend in need (which he's still using), and this justified my move to the MicroRocket. I have been mostly happy with this move, though I miss some features of the PocketRocket
The MicroRocket has excellent flame control, comparable to the previous model. It functions just about the same, as well.
Fuel efficiency is not as good as stoves in the modular category, like Jetboils.
The Micro scores high in being able to fit inside my GSI soloist pot, along with the fuel canister. I like to have everything together in one package.
The Micro is pretty easy set-up, though I find that in having to first rotate and then fold the chines out (a 2 step-process), the previous model was an even faster set-up, as the chines merely swung out. There is no integral piezo but I find ignition simple with a firesteel.
the PocketRocket always concerned me because the chines didn't fold out enough to allow full contact with the base of a pot. No matter the size of the pot, just the upper half or the chines were in contact. While the MicroRocket achieves a flatter base (the chines rotate so they are flat), the gap between the chines is now larger. I used to be able to use a very small aluminum cup as my minimalist pot. But this cup cannot be used with the Micro, as it will slide off. Larger pots do just fine but I dislike loosing the ability to cook small amounts of water in my small cup. For this reason, the Micro looses some points.