I'm up to 10. Embarassing. I used to be able to do 15 pull-ups. Need my damn chin-up bar, but that requires having a door frame that doesn't suck. humanodon - I owned a Concept 2 Model C. 'twas the shizzle. I sold it when I moved into an apartment complex with a Model E, but I kept the wind shroud (an aftermarket thing that makes all the wind blow at you). I wholeheartedly recommend them. It was great when I had the apartment in NoHo 'cuz you could sit on it for like an hour and a half and watch Adult Swim and get a full body workout. You can buy 'em on craigslist for about $350-$500 and they're totally upgradeable to the e-series computer, which allows you to interface with other rowers on the Internet'n'stuff. Also, they'll take a heart rate monitor (Polar). If I had more space I'd get another one. They're dope. They have like seven moving parts, Concept 2 sells them all, and you can completely overhaul one in about two hours with a 1/2" wrench and a screwdriver.
This is exactly what my apartment building has. I'm the only one that uses it, so that's a plus. I've been doing sets of 2000 meters and trying to best my time with each set (while maintaining technique of course). As it's the apartment building's machine, I can't upgrade it.
Yeah, but you don't necessarily need to. Something to keep in mind - if it's got the old-style computer you can't really measure your technique as well... and that if you're looking for cardio of any kind, 2000m isn't quite enough to do it. Slow and steady is a lot better, which you'll discover if you throw on a heart rate monitor.