I would rather be dragged from Springfield to Boston behind a septic truck than deal with Simplex.
Not a huge fan of EST but would take it over Simplex for sure.
My only issue with EST panels is that they are slow to respond to operator inputs.
For instance when the alarm is sounding and you press silence it does not silence immediately. It thinks about it. And if you panic and hit the silence button a second time it 'un-silences' it.
Just kind of weird, if you change a device the panel has to 'remap' which can take seconds or the better part of an hour.