I forward my google account to my google apps. My main issue is that all my contacts are neatly organized in google apps and it's hard to use services like Google+ or Google Voice when they pull contacts from my gmail account.
It's a minor nuisance but switching it around and routing everything to my apps account solved that inconsistency.
Could you elaborate on that? Does the "Send mail as" feature in gmail not work sometimes?
That's probably fine in most cases but I was getting inconsistent results when people replied to my emails. Some were addressed to my domain and others to my gmail address.
I was also concerned that this might give me a slightly higher perceived risk in some SPAM filters.
Like I said earlier, none of this was a huge deal. It was just one of those inconsistencies that led me to routing all my mail to Google Apps.