I hear M2's are more work than U2 or SC2's.
I share my home with a M2 and a G2, the little G2 often seems like it is 6 of Jasper!
I swear there has to be at least that many of the G2, all playing a intense trick on me, one chewing something, another flinging food, another talking some sort of gibberish then laughing at a personal joke and shrieking for emphasis, one on my lap nipping my thumb for not scratching the right place, one chewing off buttons on a new shirt and one running off with the remote! (is that six?) Its like living inside a crazy cartoon with that little imp! <img border="0" alt="[laughing]" title="" src="graemlins/laugh.gif" />
All this while Jasper sits, occasionally walking over to beg for a pellet, or sneak a drink of water. Personality (and the Goffin has more than its share) truely seems to be the deciding factor with these two.