Thank you all for your replies and pics. I agree with Charles Smiley, I like trucks with real coils, too. But for me the appearence of the rest of the truck is also important.
Just a few words to the background of my posting: missing the needed space for a normal gauge HO layout I am now planning a HOn3 layout. Nevertheless I love normal gauge trains, too. I like to build and detail HO freight cars well knowing they will never run on a real layout, maybe just a few meters on a display track. So I am primarily interested in perfect detailed trucks, the running capabilities are rather secondary.
In the future I will need some other types of trucks like Arch bar and Andrews. There are so many supplier of trucks (plastic and metal) : Kadee, Walthers, Accurail, Atlas, Tichy, Bethlehem Car Works, Greenway products, Athearn Genesis, Exactrail, Eastern Car Works, Roundhouse, Bitter Creek, Tahoe Model Works, ...
So it´s very hard for me to check the accuracy and details of all that products as I am not an US resident. Maybe there are some guys who know some of the mentioned suppliers and can give a short conclusion or some comparisons on their truck products.
Just for example, Tahoes AC&F Archbar trucks seem to be unequaled in details although without working springs. Unfortunately the Tahoe Bettendorf truck is the caboose version with leaf springs.
Thank you
Goelsdorfer