I think when it comes to Seedboxes you should try it for at least 1 month first to see how it works out, then you can decide after you have your own personal experience with it, its kinda risky to just sign up for a one year service that you are not completely sure about, as that might place you in a very bad position if you are not satisfied with the service after you pay that price. as the saying goes 'better safe than sorry'.

Good luck