Luka was fine at home by himself. He was my only dog until about 2 months ago. It did completely change my lifestyle when i got him though. I no longer go out all night long and leave him crated, i'd feel too guilty. He's a commitment that's for sure.
He's done great with Knox and they LOVE eachother. I think it keeps them entertained when i'm gone. Even though they're both crated they can look at eachother. Luka is still fine if i have to leave him at home and take Knox somewhere. Know on the other hand, not so much.