from STABLE to RELENG?

[Jonathan Horne]

generally, how risky of an operation is it to change the branch im following 
(assuming i have a server in good working order)? 

i think i would now prefer to start following RELENG on my production servers 
instead of STABLE (not that im having any issues), so that i can keep up with 
patchlevels of specific servers a little easier.

im sure this is a common thing, but i want to ask since google didnt bring 
anything up to me on this topic.

thanks,
jonathan