I'm using a P4 1.7ES (engineering sample ) on an Intel D850MV board for my HCPC, a P4 2.4 on an Intel D850EMV2L for my main PC and an AMD Athlon 1.4 on an Asus A7V266-E for my media server. No complaints with any of them really, although the intel boards do have a superb boot time! And they tend to run cooler.
At work we ran a processor intensive CAD test using a product called Ideas. Despite having a much slower 3D card (not really relevant in this test), a PIII 933 performed the task twice as fast as a P4 1.7. The early P4's are really bad.