I had rats pretty much my whole life while I was growing up. They're really great pets. I have a lot of fond memories of them. Although (the ones we got at least) do tend to develop tumors later on in life--so there's some sad memories as well.
They can be snuggly and are really intelligent and curious animals too. I'm glad you have more than one, since they can keep each other company.
Edit: le grammar
Yeah, not looking forward to when they pass. Only a couple of years. The one that made my wife fall in love with the idea of rats will break her heart when she passes. We had been looking at the idea of rats for a while and decided to stop at a few pet stores to see their rats. At the time, my wife wasn't convinced she'd want a rat, so we were test-driving, so to speak. First store had an impressive reptile collection, but their rats were feeders, which aren't very cuddly. The second store had Latte, which was the rat that made my wife's heart melt. We moved on to a third store that wasn't very impressive and decided to go ahead and pick up Latte and a cage. The store employees could tell we would be back. They didn't even put Latte back on display. We got her and a companion. Sadly, that rat died of an URI 3 days later. The store has a 7-day guarantee, so we replaced her with another rat.
I had read that you should never own single rats. I'd hate to think of Latte being bored while I'm at work or asleep. We got her another companion, so all three of them will hop along and play.
Females tend to get tumors, which is unfortunately what we have. We didn't want males marking up everything, so we went with the prone-to-gigantic-growths rats.