I did both. A fresh wipe and then install works fine, but right now the market app is not showing on gingerbread for me. So, I then nand restored my v38 kaosfroyo and did a no wipe flash from it. It saved about half my apps but still no market.
The main apps I use are there though. Except for twitter... I am trying to find a fix for twitter.
so just come on over from kaos froyo v38 with no wipe. Like kaos said, this isn't as smooth as it will be in time and has hiccups. But, I just want the fun of staying with it since the beginning. Plus, if you ever were in a pinch you can just go back to a backup of v38 for a few hours or a day.