I first tried the demo in a VBox running under eCS. No go.
Then, I tried in a more modern VBox under Win7 64 bit. Works pretty good, but no serious testing done.
Okay, so I made a real CD, and tried it in my old 800 mhz Athlon system. Not so good. The system has a SYM8XX SCSI card in it (for my scanner). I did not analyze every attempt, but it looks like ACPI is not set to use the /VW parameter. I just disabled ACPI, and it finally booted. That was as far as I went.
Then, i tried on my new Lenovo ThinkPad L530. Surprisingly, it went straight to the desktop, with no complaints, using the default setup. Unfortunately, the Realtek Multimac driver has a bug that causes major problems on this machine, so it hung hard (same as what the real eCS 2.1 does). So, I tried the preboot menu options. One of which is an alternate driver for Realtek 8169 (no other indications of what that might be). It turns out that it is the RTGNDA driver, which does work pretty good in eCS 2.1. Unfortunately, it seems that RTGNDA.NIF and RTGNDA.OS2 do not exist on the demo, so it doesn't load. Anyway, it gets to the, pretty good looking, desktop. At that point the stick mouse works fine. The touchpad also works (but I hate those things, and there is no way to turn it off). My USB wireless mouse goes crazy. In the preboot menu AMouse is selected, but AMouse is not used.
So far, not too bad, but there is still some serious work to be done.