i’ll answer the best i can,
the flex not one bit, tbh in real life use you dont see it, its the videos that show it up, the big stainless front panel contributes, for the record i have vids of my l1 flexing also.
beauty is in the eye of the beholder, i cant say i prefer one over the other.
build quality you can’t determine build quality of a picture, most of which have been processed. i bought a brand new lr24 and had build issuse which is why it got returned. the evo is still evolving, if you see the latest version it has a new set of legs and chassis rail. theres really not much you can pull between the two machines in terms of build quality, thats from an untrained eye, ive been inside both machines,theres differences in construction materials etc,
if you’re going for value for money then the evo is a clear winner in this regard,
to add, the tech involved in the evo is better, you have more control over temp, which in espresso is everything, so in terms of that alone id pick the evo over a londium