We have 2 sisters -- had them for about 6 years or so now.
They're great pets. The bigger the cage you can them, the better. Ours have a multi-story cage which they can leap around in all day. We've also got a "flying saucer" exercise wheel (not really a wheel - you can see it online via a Google) which they absolutely love, but we've lost the fittings for it now and it makes one hell of a racket.
They're cheap and easy to feed -- just make sure they've got water, and top up their bowl with pellets when they've run low. You WILL need to clean them very regularly as they can become a little stinky. They also tend to chuck their poo, food, and litter (we use cat litter for bedding) out of the cage for some reason. Headcases -- you can watch them do it...pick up the little sticks of food or poo and just throw it at you.
They make a lot of funny noises when sleeping, and also bark like a little mini dog occasionally when they want attention.
Bathing them is a case of filling a suitable receptacle with volcanic dust/sand. They then instinctively dig and roll around in it to clean their fur. Lots of fun to watch, but it drives our dog bananas.
They're also VERY smart and good at escaping so make sure you keep their cage perfectly secure. In the old cage we had them in, the locking latch part was lost (they stole it), and they then figured out how to get out by one of them lifting the sliding door and the other getting their head in the gap.
Ideally you'll want to be letting them our for a run-about once or twice a week for an hour or so. To do this, you're best to give them their own room or cordoned off area in the kitchen. Make sure the walls are high in the enclosure as they'll pull off some matrix-like maneuvers to get out. The kitchen floor is generally best as there usually isn't a carpet to get mucked up by their pee/poo, and very few ground-floor electrical cables.
They will chew ANYTHING so really keep them contained to the middle of the floor. In our last house they got doors, door-frames, skirting board, electrical cables (I only realised they got my Xbox controller cable one night when the frayed part on the floor shocked me in the toe!). Now that we have our dog we can't let them out too often, unfortunately, as he goes ape****.
Oh, and when they're angry with you they sit up on their back legs going "HMP HMP HMP!" and squirt wee at you. Very nice getting a handful of that when trying to catch one of them under a table.
They are hours of fun watchin them explore, just sit back watch a dvd, and let them do what they do best, very entertaining!
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I love father ted.