dndrich The IMS basket I showed in the picture above is what I was using with the Gaggia. It wasn’t advertised as a competition basket (though I understand the spec is the same as a competition basket).
Comparing my IMS with the Lelit supplied one, I think I prefer the IMS - just on naked eye observation it seems the holes are more uniform and tighter.
I made my first coffee tonight with it, using a coffee I’ve not yet used in either the Elizabeth or my grinder, in the 17g IMS basket and I got a sweet coffee. Suppose can’t complain too much with that result.
Tamping on the portafilter though I’m finding I’m having to steady the PF from rocking, which is new to me.