I've been running the current tree with automatic updates for a few months now. Stage 2 was released a couple of weeks ago and I upgraded to Apache 2 the very same day. I did have a problem which KH support fixed for me and then I found I had enabled a module in that stated not compatible with Zend Optimizer (DOH) so be sure to read all the text in parentheses.
But other than that it's been working flawlessly. It does use a bit more ram but I never see it get anywhere near using all of it. Typically I see no less than 85 megs free and a huge part of that is because of Clamav and ASSP.
If you make manual modifications to your httpd.conf there is a command to run to commit them to a database so that they won't be lost. I have seen this fail once so be sure to save them someplace else too.
Switching between PHP modes (default php version, suexec on/off, suphp, dso, cgi, fcgi) are all super easy now by going to "Configure PHP and SuExec" and no longer requires a full recompile.
Also you can save multiple easyapache 3 profiles too so it will recall all your settings for you whereas before it was simply "load previous configuration".
Any more questions or info I can give please let me know