GstarCAD is another option and cheaper than BricsCAD. BUT, it has some flaws. If those flaws don't affect you than it's 'better' in my opinion. GstarCAD is closer in comparison to AutoCAD LT: The interface is more familiar and it supports what is basically the same dynamic block functionality. The two biggest issues I recall with GstarCAD were the draw order (I'd have to restart the program to get my draw order to fix itself) and poor PDF attachment support (bugs while printing). The draw order issue might be fixed in the lastest version, but I'm not sure. BricsCAD has better PDF attachment support and none of the draw order issues (as far as I know) but lacks a built-in dynamic block editor (but you can use dynamic blocks). BricsCAD also has a really good LISP IDE (but only important if you write your own code).
There are real reasons people don't use the CAD clones (I almost hate calling them 'clones' these days), they have their drawbacks. But I hope they gain popularity because I think that they will be the ones really keeping LISP alive.