I've been using Pidgin for quite some time now. I've stopped using it yesterday. I noticed Pidgin eats too much memory. Especially when I am talking to someone, when conversations window is opened. It eats even more then Firefox. More then 100,000 K.
On the other hand, Miranda has really small memory usage.
This is big dissadvantage for Pidgin and I surely won't use it anymore (or untill memory usage problem is normalized).