I appreciate all of your feedback.
Sounds to me, given I am happy with my espresso, it would likely be small improvements to my med/dark roast coffee quality but perhaps bigger improvements to the user experience. Which makes sense.
I had assumed e61 groups were preferred due to their thermal mass and subsequent thermal stability. But from what you guys have said, perhaps that is not the case and actually thermoblock setups such as the decent are actually the way forward for increased control.
I do have a flush routine with my cherub to try and keep things as consistent as possible. To start with I’ll pull a shots worth for water through the group. Then I’ll prep my shot. Then once my portafilter is locked in I open the steam valve to drop the pressure in the boiler, enough so the thermostat kicks in (doesn’t take much, quick blip). Once the pressure in the boiler peaks and the heater switches off, I start my shot.
I guess if I ever went down the light roast route, i.e my taste preference evolves, then maybe I would benefit more so from an upgrade with improved temperature stability etc.
I think I may just keep my eye out for a good quality used machine, see what comes up over the next few months and jump if a good opportunity arises.