[a_c_s]

the only danger there, having used both Sprint and SPB, is carry traces of system and registry entries/tweaks to new ROMs where they don't belong, don't work well, or possibly even conflict...a lot of times this will work, but some times it won't...it is definitely the quickest way to upgrade ROMs and restore, but the more proper way to do it is to set up a UC folder (free program at XDA) or use Sashimi...either will auto install your cabs, program settings, etc...I use SPB just to restore my PIM data usually...