Much faster boot up, shut down, opening and closing applications, and last but not least faster file transfers and creation/deletion of partitions.

I may not have fully understood your question, but those are some of the advantages of having a SSD. Whereas there are some disadvantages: Very high price and small storage capacity (60, 80, 120, and I think 160 maximum) compared to regular hard disks.

I'd look into buying a 7200 RPM hard drive and installing it rather than a SSD one.