I find Unity's subscription plan idiotic, it makes no sense to me. The price is too high for what it is, and even after you give them the same amount as the full price for pro, you don't own anything. You have nothing if you stop paying. I would never sign up for that. If you want Unity, you should just pony up the $1500 and be done with it. Now is the time since you get Unity 4 and 5 included in the same deal.