I've been testing Showcase now for about 2 weeks without any issues. I haven't had a single problem arise so far. It's a feature rich and intensive Add-on that truly provides a great way to display something of value to you. Great product, great author, 5 stars all around.
Absolutely fantastic mod, I moved my "main content" to this mod, and have no regrets what so ever. Support is top notch. Only reason I am rating it 4 stars instead of 5 is that it is an RC., though there are no show stoppers in it for me, there might be for some.