Owning a 5300 and 2 190s I would have to agree that they are both pretty bad. The 5300c works for the amount I have tested it but I have not noticed any failure issue yet. I have 1 dead 190cs probably bad logic board or bad power socket...I am not sure what. The other works fine generally but often it will not start back up after going to sleep and requires a PMU reset to work again. It also resets its networks preferences for no apparent reason. Finally, the trackpad is the most flimsy thing I have ever used.

Now if only I could find a 5xx series powerbook to get away from the instability.