Yes, I have seen this film, and to say the least it is very interesting.
Eastwood is only in about a 20 minute segment, and it is the most different role Eastwood has starred in in his whole career I think.
Music for part of the film is by Morricone, and is very 60' ish in style to say the least.
You will not read or see Eastwood ever speak about this film very much.
The film had a very limited release in the U.S, as it was so far away from the image Eastwood had developed in the Dollar series, and the U.S studio system eventually put a lid on the film.
In fact I have just sold 15 very rare U.S press stills to this film, which had some striking and weird images in.
A film which is well worth seeking out , merely just for curiosity value really.