eise..
See posts by axebeatz in this thread. Many more users at TNT-Audio forum.
From what I read the sound blossoms when connected to good PSU or a 7AH or higher battery.
The Chinese factory can not keep up with the huge demand! US dealers are putting them in as back orders. There are many group buys going on at TNT-Audio group at Yahoo! Best way to get one one is to put your name down in a group for EU.
There are improved designs coming up based on TA2024, TA2024B, TA2020 chips and the TA2021B (50% more power) chip.
I have couple of other projects to finish off so will wait and watch for a while before dipping in.