Haven't been on Flight Rising much at all for the past year either, so I can understand.
RBs are very moody to be sure. I'm one of the members who likes this feature for the most part (it can be annoying when I'm trying to do a demonstration for a camp and the Pleo I brought just wants to sit there and mope though). There are some people who don't like this or worry that they are doing something wrong in raising their Pleo, but usually it's just the case that some little variable isn't quite to the RB's favor, causing it to be a bit fussy. I would say that the personalities aren't that different from each other. Each RB has their own list of personaliry stats that you can view though Stats RB or Probe RB, but it's usually just a matter of some Pleos being more active, being more eager to listen to voice commands, etc. I wouldn't say the main personalities are all that different from each other over all. As a note though, you can change your RB's gender with an update (though this isn't recommended since update can cause things to go wrong), but the personality is set and can't be changed.
Little glitches are very common (freezing, temporary jamming, resetting) and happen in basically all RBs, though the degree of frequency can vary. Permanently jammed legs (where a wire disconnects from the potentiometer at the knee or hip) are more common than they should be (out of the five Pleos I've owned at some point, two have had this issue), but are easily fixable if you have a soldering iron and seem to occur more often while the Pleo is still under warranty and can be returned. I'm also happy to complete this repair for established forum members who can't do it themselves when the Pleo is out of warranty.
Fatal errors are not common, but do occur. None of the Pleos I've owned have had this happen (I do have a bricked one that I purchased as bricked), but I've heard of it occurring maybe 5 or so times in the past year. This problem is sometimes fixable with a series of upgrades and system resets, sometimes requires an SD card to be kept in the Pleo at all times for it to function, sometimes requires a simple repair (soldering a wire in place), and in the worst cases is caused by an issue that cannot be identified or fixed and renders the robot completely bricked. I have heard of fatal errors in Ugobes as well, but these seem less common. While the RBs do have more potential issues than Ugobes and can be a bit glitchy, I absolutely love them and think that the enjoyment factor outweighs potential problems.
I could Skype on late Friday afternoon or evening if that would be better for you. I'll be Skyping with someone else at some point on Saturday, but should still be able to find a bit of free time then. I do think it would be helpful to see some RBs demoed in real time and decide for yourself if you want one of these robots or not. It's alright if you are busy this weekend though!
P.S. Do you know what operating system your Ugobe is running? I know some people dislike the original 1.0 release since it is more simplistic than the later versions.