no issues but as I said we just reinstalled them a couple of weeks ago to 3.1.0.21 so they are latest and greatest. But so far chef is doing a great job updating the root password, /etc/resolv.conf and other files to our standards - and it has not yet killed a box
I am not sure how a 2000 day old VIOS would behave (not to mention that I am pretty sure that version is no longer supported by IBM since a while anyways - what do you have, 2.5.x?. Do you have any physical box with similar old OS you could try if it would generally work for that OS version? I am more of a chef user, so all I do is install the client software and run it and check afterwards that the initial run did what it was supposed to do