OK, I'm going to give the minimalist/cheap-bastard perspective. I've done some solid troubleshooting with my HP 1630G. Sure, it only has a 1K event memory, but the triggering options are pretty flexible. With some creativity, you can focus on the behavior you need to observe. It can self-clock or externally clock, with three separate clock inputs. I've used it to find some pretty obscure race conditions (one-shots are evil!) and glitches.
Full disclosure: I do also have a really nice 16700-series I got from Glen Slick, but for some things the easy setup of the 1630G wins. -- Ian -- Ian S. King, MSIS, MSCS, Ph.D. Candidate The Information School <http://ischool.uw.edu> Dissertation: "Why the Conversation Mattered: Constructing a Sociotechnical Narrative Through a Design Lens Archivist, Voices From the Rwanda Tribunal <http://tribunalvoices.org> Value Sensitive Design Research Lab <http://vsdesign.org> University of Washington There is an old Vulcan saying: "Only Nixon could go to China."