Plenty of tryouts, free, not so free, free-but-if-you-want-it-to-work-pay scripts, that's what populated my nights on the search for a flexible, well documented script for an online image gallery .
Monalbum is all that : flexible, flawless installation procedure, NO PROBLEMS whatsoever and I was mostly impressed when I saw the code. It's clear, commented "by line" and you know where you're going.
This is great for customization.
No doubts that the conceptor is a pro.