The basic thing to remember here is that you do not in the least need an outbound firewall. It is because you simply will have no use with the same. What you need to take care is that Windows Os already has an inbuilt firewall and you need not be wary of the need for outbound firewalls simply because it is not necessary.
What the latter perform to your system is very simple. You will be creating more restrictions over the programs when it comes to connecting to the internet. The next important thing that should discourage you from going for an outbound firewall is that it will not give you enough security against malicious programs and hence the very function of having one is made null and void by its inherent weakness.
What I am saying is that these Outbound firewalls are not completely futile. They do offer good protection but the important thing is that not all users need to have it simply because you will not have any use having it. Moreover you can see that some of the features that exclusive outbound firewalls claim to provide are already provided by the Windows firewall and hence you need not worry about the connection and the variety of security threats that come wit it.
What this imply for the general user is that you are in no way required to have an exclusive outbound firewall because you are simply wasting on your money and resources. These outbound firewalls belong to the category of those programs which make you own them in order to have a good feeling within you. The enlightened user is not prone to such unwanted needs and if you want to be one, you better realize the folly in possessing an outbound firewall as fast as you can.