humm... A better question would be "what are the negative side effects?"
But you asked, what are the benefits?
Thats pretty self explainatory bro.... you'll be on juce longer, thus giving you a longer time to reach the goals you wish.
But with that, you'll also be putting more stress on all your enternal organs.
Do people run low dose cycles that long? Yes they do. But you want to make sure that you're getting blood tests done every month to ensure that everything is ok.
A lot of this would depend on your age... if you're 35+, running a test cycle at that dose could be very beneficial to your heath.
If you're in your 20's... i'd say that its not necessary.