I bought a Defy for my daughter for Christmas, it arrived yesterday and I've been setting utter up ready for her. As far as i can tell, despite having a lower spec overall, it's faster and more stable than my Galaxy S. For example; it took me about 20 minutes to download and install over 25 items from the Market, one after the other. When i tried the same with my SGS (when i first got it) the phone frequently crashed or froze. Another example; I've installed the Spotify Premium account that we share, and Spotify opens very quickly on the Defy, but very slowly on the SGS. The Defy's GPS seems to be spot on, much better than the SGS's. I'm increasingly tempted to sell the SGS while it still has some value and buy SIM free Defy.