I did add the bestsellers mod to 4.18.
I was having errors thrown from the addition of the following code to the bestsellers.php.
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foreach ($bestsellers as $i=>$item) {
$bestsellers[$i]["tmbn_url"] = func_get_image_url($item[productid],"T");
}
$smarty->assign("bestsellers",$bestsellers);
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Since it didn't make sense to me on why this was added, I just left the original code on that page and modified the .tpls. (Appears to work fine.)
http://www.naplesvalley.com/
PS. I didn't try the "recommends" mod.