Latest Lanvin sneaks at Mr Porter and Ssense are only in stock up to size UK10/US11 -- I am a UK11/US12 which is still 100% part of the "normal" sizing continuum -- so where the hell am I supposed to buy the ones I like?
Andrew handled them in person and said the "leather was super cheap"
I don't have the side zips, but I do have a pair of S2A's chelsea boots from a couple years back. The leather is decent enough... I mean it's not as nice as the leather on my MMM side zips... but I got the S2A boots for less than a 1/3 of what I paid for my MMM side zips (which I got 50% off). So if the leather is similar to the ones I have I'd say its probably pretty reasonable quality for the price you're paying... It's not great - but if you want great leather you're probably going to have to be paying more than $250 for a pair of side zips