I have been using OmniWeb exclusively for 3 years now. It has served me quite well with minimal problems.

I am now using the 5.9.2 version which incorporates the new Nitro WebKIT engine. Although this is an alpha release, it has been rock-solid so far and is extremely FAST! It also passes the Acid3 test along with Safari 4 beta.

For me, the "site-specific" preferences are a "godsend".

Also, a huge plus, is that they actually have tech-support. When I have had an issue or question, I have never had to wait more than 24 hours to get a helpful reply.

Now that it is free, what are you waiting on? Download it and try the best Browser going!