I have had a quick go on my friends desire s which was running 2.3. Compared to my defy it looked modern and felt sturdy. As for the os improvements and the sense overlay compared to my 2.1 blur (soon to be 2.2) it was similar. Some differences with the menus etc. front facing camera on the s ,but how much it’d be used I’m not sure.. Processor is better than the defy but I doubt it’d be noticed unless playing games.
Not tried a hd!
Just buy one and try not worry too much about os stuff.
Rick.