I just adopted two puppies that are three days apart. A male and a female. I would say for the most part it has been wonderful. They never cry when I have them gated in my laundry room...or if they are in their crate at night. I think they made an easier transition to their new home together. Plus, when I need to get things done around the house they have each other to keep them company.
Also, I am glad to have two because I think my family would get into an all out brawl if we only had one to play with
We are training them to go potty outside...and I had to start taking them separately because they just play together if I don't. It takes up a little more time...but they are worth it!