The normal drums produce great results in an ATL-1000 or 2300. Any process.
The expert drums command a massive price. The std adjustment on the ATL-1000 gives pull of 1/2 stop through to a push of 1 1/2. An incentive to get better at metering!! Further out, then the hundreds you save from the 1500 will pay for a pro-lab to do the extra push or pull.
The bigger ATL machines go for less money here in the UK, since too bulky for the majority of potential users. Whereas the 1000 and 1500 are dear on rare occasions they appear.