I been using vagex since summer and every single day as I run it on my computer using the viewer. They really treat their active viewers right as well. I got 5,000 free credits by vagex 2 days ago, because they apologized for the delay in server migrations, which should answer the question, why they been terrible lately.
They are honestly good with delivering views before the YouTube update and again,the reason why vagex been slow is the fact they were moving servers and made updates with viewers.
Now I am getting views on my videos a little faster now, I think in another month or so, it should be back to it's normal pace of delivering views. So I say grab a good 1,000 credits because it will last you a week on a single video.