So I've been served very well and I've been happily using ArcDPS build templates already for the past two years. It works great, and has became a popular tool I use a lot to change builds. I have been able to change into many different types of builds (I have 8 saved) and I haven't had to pay for it.
From what I understand, Arc Build Templates will no longer work for me when GW2 Build Templates goes live. Not only will I have to pay for this to achieve a similar level of functionality, I will actually have access to less builds.
This should be a great feature... so why do I just feel sad and disappointed? I'm not excited for your build template system. It actually makes me sad.