I'm a DroidX user and have been using ROMs for almost a year. I just got my wife a Thunderbolt and want to put a ROm on it. The primary reasons are for battery life (no 4G in the area, so not related to 4G usage) and she likes my apps. I'm using CM7 for DX and she likes the stock Android apps more than the ones HTC gives with Sense.
What would be a good ROM to try.
Also, if she decides she doesn't like it, how does one go back to 100% stock Thunderbolt?