This is fantastic, thank you for implementing this and releasing it so quickly.

A small suggestion I might add regarding the current display for columns per row.

Number of Reviews Displayed Example:

6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51.

Rather than having so many options as shown in the example above, you might consider skipping a bunch of options and maybe having something along the lines of the example below.

Reduced number of Reviews Displayed Example:

6, 15, 24, 33, 45, 51

This is just to ensure that each row will always display 3 columns, as long as there are enough reviews to fill all the columns.

Based on the current selections, the last row will almost always lack columns based on the options currently available which include 10, 20, 40 and 50.

Other than that, this is really great, thanks again for such a quick turnaround on this :)