I've been using Diptrace for a long time now, and I've had my ups and downs with the software, but pound for pound it can match anything on the market. Really, to date I haven't found anything that even comes close to the ease of use and feature set that this program offers.
However, I've never liked to use the Auto-placement or Auto router because I think (personal opinion) they are both quite useless and if anything, take away from a great program. They seem to pick the first viable route or valid placement and stick with them.
So, in my travels to try and find something better, I came across Topor Lite. I played with it for a while and its not bad, but as usual, its extremely difficult to really work with and while it can find valid placements, its painful to use.
But a few days ago, I found this http://www.freerouting.net/
It is simply the BEST auto-router I've found ! It will sit there and run for as long as you want it to, and for a change I can actually get some high quality valid routing from there with only minimal edits, but best of all, its DEAD simple to use and really opens up the power of Diptrace!
So, just thought I'd share that in case anyone else suffers frustrations with Diptraces Auto-router (for those that actually use it anyway)! Now, if only I could find a Auto Placement tool!