"Total Reviews," which allows the user to set a minimum and/or maximum number of reviews a provider has received, is currently under "Price for Service."  I think it should be in the the "Search Options" section.  As it is, it appears only to apply to the "Price for Service" option, when it actually can be used on its own.  I find it to be a useful option to get more reliable results and to eliminate from my results providers who had one or two reviews, then disappeared.