I've had about 5 Plaubels in the past 10-15 years or so. Whenever I sold one, I felt awful because of the wonderful lens and surprisingly accurate metering. Of those cameras, only one had a problem and that was with the winding mechanism. It still worked, but took about 3 winds to get it to advance all the way.
Currently, I have 2 Plaubels, one is a 670 (highly recommended cuz it takes 220) and a 67w. I got the 67w for $450 because the owner said that the meter didn't work. Well, I cleaned the crusty contacts and made sure the batteries made contact and it worked just fine. I WILL NEVER SELL THESE. Take good care and be gentle with them, especially when advancing the frame, and they will last.
They are worth the money I spent on them, but I wouldn't pay $1500+ for a 67 or 670, maybe a 67w in mint condition. I would think that a 67 in ex cond. should bring about $850-$1000.
As mentioned, there are alternatives, but they aren't the same. The Mamiya 6/7 is great, I had them, but they fill a different niche and take up more room when hiking. A Rollei 2.8F or GX would be a nice substitute imho.
Just my 2 cents,
Joel