OMG I am so glad you asked. LOL.
They can live 10-15 years. I am glad
The cuddly fact..let me tell you. They are not still creatures. They like to jump, play, all over the place (Which is why they are SO entertaining) MOST chinchillas don't like to be held. Casanova has no problem being held for short periods, but Valentine and Romeo do. They also will run away when you try to get them LOL. But they love what I call "Chin scritches" which is scratch under the chin. they make and ADORABLE "Chinese" face. LOL. But they are independent. They will run up to you, jump on you though.
A good adult will weight about 800 grams. Sometimes it can be lower, like Ebony chinchillas tend to go as low as 600 grams. They really are the size of rats, but thier fur is so thick and plush, lol.
They don't have to be kept in pairs, they do fine, but I reconmend it. It gives them a play mate when your gone. Bonding can be hard, although I have had no problem with it. It is easier than bonding buns. A lot easier.
No litter box training here. They just poop, I have been told (Not 100% on this) they can't control when they poo. As for peeing, its is relativly oderless (they are very oderless animal)
Personality is just like trying to describe a bunny. Each Chin has a different personality of course. Valentine is a sneaky, michevious little devil. He likes to steal treats and show me his testicals (LOL no I am not kidding, thank god they are not noticable)
Casanova is such a sweetheart, gentle, kind.
Romeo so far I am still deciphering.
I would say overall: Sneaky, playful, outgoing, troublemakers (in a good way), active
Chins are great chewers. The worst. They are very suspectible to impaction, and you must be wary of what you put in thier cage. Plastic is a HUGE no-no as MOST chins (Mine don't) will chew on plastic, and either chock or get long-term impaction. Fleece is popular because its a harder fabric to chew and the fibers are a lot more degradable than other fabrics (Even cotton) My chins don't chew on it.
They are super healthy. But they are fragile..don't grab them too hard. It is not a fragile as a new born baby, but you do have to be careful. The most "common" is poor skin due to not enough dust baths (Although I have heard of too many!)
They are also can get ringworm very easily or other skin problems, but with proper care and dust baths these can be avoided.
You can let them run around, but they will chew. I would suggest the bathroom since there is no carpet (My chins don't chew carpet, but it does happen) and its easy to clean the dust from thier dust bath. They have chewed on the cabnients (Not major however) and the love to destory toilet paper. They are jumpers too, literally Valentine once jumped 4 feet from the ground. No joke.
As for noises, the are pretty much quiet but some they can make noises. Here is a great website that is pretty accurate.
http://www.chinchilla-sounds.de/index_en.htm
I will work on the video..I never posted one before but lets see!
Other facts:
Rabbits carry Pasturelies (Sp?) dormat that is deadly to chins, so I wouldn't reconmend housing in the same room. Obviously I live in an aparment, but the cage is also high enough to wear Sheriff can peer over, but other than that there is no contact.
Buying wood for them to chew on CAN be expensive.
Dust is realivly cheap, but you have to order it online (Pet store dust is crap)
Cages are expensive because they need a high quality cage. They also can't have plastic shelves, so you need to buy/make wood shelves (Easy to do)
Great brands of food are Purina Show Rabbit, Mazuri, and Oxbow. They also get unlimted timothy hay.
They are very sugar intolerant. Treats must be giving sparingly, but there are some treats (Rosehips) that can be given daily
They are nocternal mostly, but do play during the day. My chins are most awake 6pm-1 am. But with good shelves, you can barley hear them play.
Very oderless, clean animals
Umm..I think thats it! LOL!