is this a good deal?

Hey! I am being offered a BMW E21 1981 320i 6 cylinder
no info on mileage but owner says its a lot
clutch not working

price is $1200 is this a good deal?

Well. I got a 1979 e21 for 1200

Sorry sent that without finishing. Mine was running and reasonable sound. But I think if the body is straight and without rust (tap/check the sills next to each wheel well) it may be ok.

how good do these cars run? I am looking for a fun BMW, I already have a E34 525i

Well, 1.8 l 4 cyl. So it's not crazy fast, but solid, loose in the rear. Some really good suspension options avail (top end), good engine support from Ireland engineering, easy to work on. I love the wee bugger. I haven't replaced a clutch yet, not sure how easy that will go

You said 320/6 right? Very similar to the 323i, the top two engine to transmission bolts are real buggers to get too, I had to use 3 one foot extensions with wobblies to reach them, if you remove the radiator and tilt the engine back (being very careful not to crush the heater core hose at the back of the cylinder head) they are just accessible by going over the transmission and having someone with little fingers guide the socket onto the bolts. The only other hurdle is the starter bolts, one is easy, that's the one you can see, the other requires a special tool because it's behind the starter motor and under the intake manifold, the special tool is this crescent shaped wrench that also has a spiral to it that allows you to hold the nut as you loosen the bolt from (yes you guessed right) the back of the transmission.
Hopefully this is enough information, I wouldn't say it's hard if you know the procedure, but it is time consuming and can be frustrating.
If the body of the car is sound I'd say do it, the m20 engine was very reliable, if your 525i is 91 or earlier it is essentially the same motor.

i own a 320i but it is a 2.0 liter m10. it is a zippy little car that is somewhat easy to work on

if there is no rust than it could be a good car