Have been using the one Liter since it first came out as an REI product, maybe 5 or more years ago. It replaced the old aluminum version that weighs 2 oz more.
As was pointed out, the insulation on the handles makes it possible to grab or steady the pot barehanded. I do NOT like the top because it clips over the outside of the top rim, loses its tightness after a while, and pops off when pulling the pot out of the stuff sack. I've written to EN several times, begging for a top that fits tightly INSIDE the pot, but they just blow me off. Someone suggested in an earlier thread to install a couple bolts in the top to create more friction to hold it on, but didn't go there. Also contacted the guy who makes pot lids, but he doesn't do EN.
Still use the pot because a Coleman 16 oz canister (unrusted) fits perfectly into it, with space left over, and lasts for a week in the Rockies (not at lower altitudes though), and a Ti Gigapower wind screen fits perfectly capped over the pot's bottom for packing. It's the least worst of the alternatives.
I use the large size, to have enough hot water for self and two Shelties, and for tea and such later on. No Spartan hot toddyless one shot Esbit boil for me. For cooking, I use a Ti bowl with handles that came out of a cook kit. Now if only I could find a bowl with as much capacity, but a smaller diameter the same as the Pasta Pot, to make packing and unpacking easier. Think I saw an EN one today in a shop, but it was $65, way to much. The search goes on.