Redirect admins to dashboard, everyone else to home page.

my_pmpro_login_redirect_url.php

<?php

/*
 * Redirect admins to dashboard, everyone else to home page.
 */
function my_pmpro_login_redirect_url($url, $request, $user) {

    //only do this if we have a user
    if(is_a($user, 'WP_User')) {
        if(in_array('administrator', $user->roles))
            $url = admin_url();
        else
            $url = home_url();
    }

    return $url;
}
add_filter('pmpro_login_redirect_url', 'my_pmpro_login_redirect_url', 10, 3);