The 120 GB is more than sufficient to accommodate Windows and major software and games you use. The large volumes of data (pictures, music, videos ...) will be stored on a standard hard drive, less expensive per GB.
For 65, I find the upgrade worth the shot.
For cons, I put only 3 stars because to achieve all these results, I struggled a full afternoon. If you are starting from scratch and you can afford a new installation of your operating system, it will be very simple. You unplug your old drive, you connect the SSD instead (provided that your turn has the correct connectors, of course: SATA), and you start installing your OS. Easy.
But if like me, you need to keep your configuration, user accounts, installed software, etc., and you do not want to start from scratch, so there courage. For PNY does not help you, the box contains the hard disk, a plastic rectangle with I do not know what it is, and that's it. No cable. No screws. No installation manual. No help CD. Not even a link to online help. By searching the site PNY you will find a very succinct explanation single page and a short video. Largely insufficient to understand the entire operation.
Some manufacturers provide the necessary cloning software that allows you to replicate your current hard drive to the SSD, and boot from the SSD without the computer will not realize anything. No software here.
I managed to get out through the guide very well that I have found here: [...]
But otherwise I think I would have given up.
In conclusion: if you're not afraid of the computer yourself, or if you are starting from scratch as regards the installation of the operating system, SSD will give you full satisfaction. If by cons you need a little help and you want to keep your current OS without any reinstall, there may be other brands that come with a bit more the user.