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Recent Migration 1.5.25 - 2.5.4
First I did a complete backup, and using kickstart I installed this on my local PC.
The I did a complete upgrade to the 1.5 template so it would work in 2.5
Then using Jupgrade I upgraded to the most current Joomla, updated extensions/components, and replaced a few extensions that were not compatible any longer.
Then took a backup of new site, and using kickstart again, made it live.
FYI: if you view these sites the sound may be loud. Get ready with mute button or to turn volume low.
1.5 site http://academyofrock.net/home
2.5 site http://academyofrock.info