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Yeah the availability of spares is a big plus point for the La Pavonis, they've basically got two models in the pre/post-millenium versions (well except for the two boiler sizes), and even then a load of the parts are shared between the new and old machines.
Is the Faemina just a nice to have machine or is it replacing the La Pavoni in regular use? Or is it more just a restoration project?
True, but you'll probably see a split between those that claim to have so little thermal mass that losses aren't an issue, or those who claim that they have better temperature stability due to more thermal mass (which would likely require pre-heating).
I've not used any of the popular offerings (Robot/Rok/Flair), but with my La Pavoni I need to hold down on the portafilter when using the lever to prevent it tipping forward. The base of the Flair does look a bit longer so probably more stable, but probably worth checking that it's not an issue (I mean, you'd hope that would get addressed at the design stage, but you never know!)