I was a little hesitant as I usually am with Beta releases but so far is working quite well, and handy on several levels for my Google work. There are some small new default settings, that I had already changed in the original, such as opening new links to tabs and stuff: but on to the bigger stuff---
- SPELL CHECK!- quite handy, highlights in red just like Word in any text boxes
Improved search engine ordering, and auto complete Google/Yahoo search with suggestions. (ironically seen complaints, that it's hard to setup for MSN... big surprise!)
Restoration of Browser Sessions after crash- biggest benefit for me so far, being a huge multitasker, who keeps crashing browsers (currently have 5 windows, 3 tabs, itunes, email, AIM open among other things as I type this) is that automatic restore of browsing session after crashes.
Other than that, check out the other features on the link. only problem I had so far was that prefbar isn't compatible, and had minor issues getting Flash reinstalled.
Other than that I'd give it a 8/10 so far, good for being a beta.
One other major difference I noticed, is I don't have the problem with it "hanging up"/freezing for a few secs very frequently as I had with the original Firefox. That was a pain streaming music, while I had too much open, and it would freeze/repeat in midstream... haven't had that yet with Bon Echo. Oh and one more thing, nicely compatible with bookmarks/passwords from Firefox, as to be expected I guess.