I found my macbook increasingly inefficient when dealing with editing programs this was beginning to hamper my work.
Easy-peezy... half an hour or so and it was all installed. I also brought a cheap HD enclosure to put the old HD in. I then plugged this in to the mac, it automatically rebooted from this and I was able to reformat the new internal HD and transfer all the data using Superduer.
Compared to buying a new mac this upgrade saved me loads of dosh-not to mention the resources used in making a shiny new product. We shall see how it holds out but for now I am happy with my lighting fast machine. Make do and Mend- that is the watchword.