I've been trialling this app on my N95 8Gb (Product Code: 0554747 (UK) with firmware 30.0.18)) for a while now and find it an excellent application to use. It turns SMS into a variant on IM, enabling you to follow the conversation much easier if it is spaced over a few hours.
Wish it could have an option to open new sms messages in Converation or merge it with built in messaging software somehow.
LOVE IT!