Reef's are simply the best.  I like the looks and they usually have more than simply a flat bottom.  They do support your feet much more than cheaper flip flops.  I like the looks and have a few Manning's (with the bottle opener) but the sole for some reason is thinner towards the front so they are not quite as comfortable as the Phanton's.  I do order the exact size with these and 1 size up for the Manning's.