I have my Hero since mid December and I adore it I can't imagine going back to a phone without Android.
It's very useful that you can link your contacts to twitter, facebook and flickr accounts and get notified when they do something.
HTC sense works like a dream with it and also can't wait 'till 2.1 is released
The messaging app can get quite laggy sometimes when I have lots of messages (like 2000-3000) in my inbox, guess that's quite normal though.
2013 Volkswagen Golf VII 1.6 TDI
2013 Alfa Romeo Mito 1.6 JTDM