If you look at this post asking how many users are on 7.1
http://forum.xda-developers.com/show....php?t=1145774
You will see that since Tuesday, only 6 replies are listed.
It does not seem to be a high rate of adoption.
I have no problems at all with 7.0.3 from my sd card.
On the other hand, I have ordered a second Sandisk 8gb class 4 micro sd and want to try some of the nightlies, I just don't want to risk corrupting my primary card.