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As the name suggests, this is a developer preview release - it isn't stable enough for general use yet. Some highlights:
It is worth reading up about what to expect in Firefox 2.0 - in all it looks like there will be a lot of improving the basics such as feed handling whilst still keeping to the simple approach and leaving extra functionality to extensions.
If you do decide to install Bon Echo, you should use the Firefox Profile Manager [kb.mozillazine.org] to create a new profile for the test installation - otherwise your existing profile has a strong chance of being wrecked by the test release. Make a full backup for your profile directory too, you have been warned! :)