I have used it without suspend and pm-utils for a week now. I did not have much time for extra testing, so it basically was one hibernate in the evening and one resume next morning. It worked fine until this morning when the machine came up but Ethernet did no longer work. I could not find out what was wrong so I rebooted and that solved the problem. This just as anecdotal evidence, as long as I cannot reproduce and debug it there is nothing we can do about that. I'll be on holidays soon, so no more testing from my side for 4 weeks.