I have used AutoCAD LT for many years. After getting work to fork out much more money for a license of Solidworks, I thought it only fair to give DraftSight a go and save the extra license fee for AutoCAD Lite.
The interface is not as polished, but it generally does all that AutoCAD LT used to do for me and it does deal with complicated (>20 layers) DWG files well enough. Those used to using paper space and model space will also feel at home (there are only a few of those in my experience).
Given the price difference (it is free) I would recommend giving DarftSight a go. Especially if you have experience of AutoCAD and have to manage DWG files.