i got an 84 318i not sure if there is a diffrence between the two. as a car i would say its very reliable i havent gotton any major problems just small stuff and 150k miles isnt bad cause i just hit 184k the other day and my car still runs like a beast.
as far as power goes that car doesnt have the best power in the world snice it got like 105hp i belive, but its still a great car and fun. good luck