After playing with for a little while it is quite nice. And I always like web based programs that I don't have to junk up my pc installing more programs...
The annoying thing I'm trying to figure out now is that the ft'in" numbers when lining up walls and doors and stuff are in a light yellow, and they are very hard to see. I've changed the dimension, text, line, etc color defaults under edit/tool defaults, but they still come up light yellow.
Pretty cool program though, but my bad eyes are hurting trying to line up measurements..