Just be careful with these 486 boards. Mine had a one time PROM on it, I was trying to add XT-IDE to the bios image and I eventually worked out that you can't erase them.
Since I saved the BIOS before I tried to reflash it, I scavenged an actual flash chip off a flakey Socket 7 board and used it to replace the one time flash chip that I more or less ruined by trying to flash it again.
As for what I did today, it was playing with my 386DX40, comparing 2 ISA cards in particular, my ET4000 cards vs a CL5424.
I have found that the ET4000 is faster in DOS by a small but measurable margin.
Then I found out that the CL5424 was much better in Windows 3.1. While it doesn't have an actual BitBlt engine on it, it does have hardware cursor and excellent windows 3.1 drivers, proving significantly faster and nicer than the ET4000 in WIndows 3.1.