Our Maine Coon kitten is doing well. When we first got him there was a fair bit of hissing and spitting from all the cats. Luckily, things have settled down somewhat.
They seem to be getting along reasonably well and don't seem to mind each other. We currently have the new addition sleeping in a separate room to his much larger brothers. The little one seems to gravitate towards them and tries to muscle in on whatever it is they are doing.
He is also starting to get bigger. It will be a gradual process as it takes four years for their full coat and huge tails to come out, however we can see a difference already. He is incredibly naughty and is constantly getting up to no good. I will keep you posted.