I dont have a no-ip account but I use dyndns.org and I have it installed on a machine behind my ASA
It does update my ip to my domain every 777secs ( i like sevens)
I have purchased a domain with them and I have ssl certificates and network monitoring with them
Never had a single problem.
Any news about this regarding Version 8.0? Maybe this is not supported by asa? I have an asa 5505 and want to use my dyndns accout for remote access.