I've been using voltrank for several months now and i must say i love it.
It can give you a nice and steady link growth comming from quality sites. All sites i promote using voltrank move up it the serps.
Check their form for more success stories: http://forum.voltrank.com/showthread.php?4-Do-you-guys-have-any-quot-success-stories-quot-using-voltrank&p=908&viewfull=1#post908
