Works fine here in an A3000D with a Voodoo3 3000 (tight fit!) and an 8029 Nic. Only issue I have is with the additional delay at setpatch. I once read this was caused by the '040 having to build some memory tables for the PCI range. Adds about a minute to the boot process.
Anyway, it's the fastest 2D i've ever experienced on an Amiga and no stability issues to boot.
Adrian