That's not a bad price for an East German, they are really nice. I landed mine a few years back for $300, with a holster, cleaning rod, and extra magazine. Really nicely made and finished gun for that price point.
Also got a few others in that caliber- a CZ 82, which is a very nice pistol but has that black polycoat on it; a PA 63 with a black anodized frame, and a rather rough looking P64, as well as a doublestack Russian commercial Mak (magwell is thicker, but the grip design makes it hard to notice; mags are rare though). The 9x18 Mak has a little more bite than the .380, and costs less usually, so I wouldn't swap barrels.
Re the 9x18: two complaints are that is usually FMJ and steel cased.
These are non-factors; the guns are designed for steel cases, just like the AK is, you won't hurt anything. And regarding the FMJ, I've seen a lot of ballistic tests online that state for self defense, you're better off running ball ammo out of 9 maks and 380s due to risk of under-penetration. That being the case, the 9x18 is loaded hotter than 380, perhaps like a 380 +P.
The one thing all 9x18 pistols share in common (besides the round): they're all just stupidly reliable, in my experience. These guns, as a rule, don't have FTF, FTE, accurate pointers, and they're heavily built so they really don't tend to break parts either. Something to be said for that.