I just purchased my "free" ($35 in taxes) Optimus S from Best Buy a few days ago and have noticed 4 fairly significant shortcomings over my HTC Hero (which was a horrible phone, but based on other's opinions I think I just had the misfortune of having 2 lemons in a row.)
1 - No external message, missed call, charging notification light, so if I don't here the audible notification I have no idea there's a message waiting without turning on the screen.
2 - No screen auto-brightness. So I have to go through the many steps to change the screen brightness to meet the ambient light requirements.
3 - Auto scrolling header and footer in Gmail email while viewing messages. Rather than staying at the top and bottom of the message so I have the whole screen to view the message, the buttons on the top and bottom stay at the top and bottom of the screen, so the viewable area of the screen available for the actual message is drastically reduced.
4 - Not standard mini-USB charging/syncing port. Although the rep who sold it to me told me it was a standard mini-USB plug, it is smaller and flatter, so I can only use the cord that came with my phone, not the several standard mini-USB cords I use for many other electronics.
I don't want to pay the extra $10/month (on Sprint) for a 4G phone, so I'll probably exchange this fairly disappointing Optimus S for the Samsung Transform. If I'm not happy with that I may have to suck it up and spend the money (up front and monthly) for the HTC EVO or Samsung Epic.
Any recommendations would be appreciated!