The best third party solution IMO is pixieset because of its ability to hook in custom domains. The only downside is the inability to customise the look and feel but the big upside is
clent password
guest password
download pin
simple but beautiful custom mail templates
customer tutorial built in on how to access photos
ability to set gallery front page as app bookmark on the phone
An AWESOME custom LightRoom plugin that links collections directly to the client gallery
my main site palmlightstudios.com - pixieset galleries = galleries.palmlightstudios.com