In our second year of having a wide range of table options, it seems to be working splendidly. As the students were writing the other day I noticed the decisions they had made about where to work.
Every small, intimate table (seating four or fewer) was occupied by students. Of the large tables, only the one on the floor had more than two students sitting there.
Setting up my classroom this way was a big switch after ten years with more traditional furniture. It's nice to see the students respond well to it.
I'd love to get rid of the big tables (at least the one with chairs) all together, but it is handy for guided reading groups.