Maybe it's just me, but I believe a "feed aggregator", or RSS reader to us plebians, is more about reading your feeds than looking pretty while doing it. Mojaz is currently in private beta, but we got a chance to go in and look around today, and maybe it's personal taste, but I just didn't see much to get excited about.
My current choice of a reader is Google Reader, and I prefer that I have everything in folders, quickly showing me which have no articles, how many articles I have to go over, and it's quickly navigated. Mojaz is laid out in columns with no discernible notification as to what's been updated except for blue highlighting. Yes, it is showing you updates, but it just doesn't seem as friendly as just seeing a number next to a folder.
Expansion to see more articles from a feed is handled with Ajax coding, so expanding and contracting is handled pretty seamlessly. Several links weren't working yet such as "About Us" and "How Mojaz Works". Jaz, the cat faced guide in the corner, can be turned on-and-off to help you learn your way around the site, but it's fairly standard fare thus far on the features department.
You can add whatever feeds you want, just like any other reader, and add a 16 X 16 icon to go next to the site's names, but again, it seems all about "the pretty", and lite on the substance.
For now, at least, I would just stick with whatever reader already suits your needs.
