Sorry, I'm still finding my way around this site, hence the deleted post above me. :S Anyway...
The Opus Expo website is indeed in need of work, although it wasn't all too slow on my PC. It loads about as fast as this site, anyway. What kind of computer do you use?
Above, veinglory said that e-book royalties range from 35% - 45%. That's true, but let's be honest here - online publishers who offer those rates are incredibly sketchy (to say the least). Even Amazon now offers an e-publishing service with quite impressive royalty rates... However, Amazon, like most other e-publishers, has a non-existent "editing team." That means any Joe-blow can go ahead and "publish" their "book," and therefore not very many people buy their books. It's true - I can post my book on Amazon, and people can buy it as an e-book the very next day. Will I do that? Of course not.
If Opus Expo has a real, professional editing team, then wonderful - maybe these guys actually are different, and that would be a dream come true. But if not, then they're just another drop in the sea of internet entrepreneurs trying to make a living.
Also, I took a look at their board of directors, and it doesn't seem that those three people have any publishing experience. But, in all honesty, as a writer I'm more concerned about the person who is reviewing and editing my book, rather than the people who are on the company's administrative team. So my question is this - who are their editors?
I was looking at their facebook page as well, and they say their "launch date" is coming this fall, so I suppose that explains why we can't find any of their e-books.
Anywho, although this publisher seems to have its pros and cons, it's definitely interesting nonetheless. I have been trying to get my book published for the last three years (unsuccessfully), and it's driving me up the wall. If what Opus Expo is claiming is true, then I'll no doubt check into them.