Same here, it's great for anything out of print. Regarding DL speed, I found it pays to try out the different free links, as they come from different sources,

Same here, it's great for anything out of print. Regarding DL speed, I found it pays to try out the different free links, as they come from different sources, but seem to have the same order (ie the fourth link will typically be the same source between books). Once you found a source that is fast, you can stick to it then.