I love this charger so far. I use it with the GT Power 12V 20A (240W) power supply. I haven't used it on LiPO's yet and haven't pushed it to the full 12 amps yet. I stick to 6A. So far, I have charged my 8.4V 5000mah, and my sons 2x 7.4V 1800mah nimh. The buttons are easy to press (you don't have to press hard AT ALL. And, navigating through everything is pretty easy as well.
Some of the negatives.. I'm not sure if the fan is working though. But I am not 100% sure because, maybe it just hasn't gotten hot enough. The instructions manual is a bit confusing. Doesn't seem like it has anything on how to operate the charger. Luckily, it's fairly easy to use. Other than that.. I'm happy.