Hey everyone, thanx for the input!
I contacted the seller to give me some more info on the condition of the player. He says it's been sitting in a closet for a couple of years, but he tested it and to his knowledge everything works. The 1228 also has a strobe light which he says also still works. The stylus will need replacement. I don't know, if it hasn't been played in years and just gathering dust, I can imagine it will probably need some servicing. Also the trip to pick it up would cost me around $20 in gas money.
On closer inspection of the pictures I can also see there's a rather large stain on the right side of the table (see picture).
As I read your different opinions I come to the conclusion that the Dual 1228 is a good turntable, probably a bit better then the Technics SL-D2, but wouldn't be a radical upgrade. For the price of $40 it would be a good buy, but with the servicing, gasmoney, stylus-replacement, it's no longer a $40 deal. I think I'm gonna pass on this one.
Btw, I live in Belgium, so I wouldn't be able to have it serviced by
http://fixmydual.com/.
I also have my eye on a beautiful Pioneer PL530. It's cosmetically and operationally in perfect condition (see attached pictures). This will probably go for about $150. Would this table be a step forward compared to the Technics SL-D2?
Again, thanx for the info guys!