I am testing it on assorted servers now. And, yes, VPNs do slow down your speed somewhat. There is an "optimal" default choice which gives the best performance -- a hardly noticeable decline in tested speeds for me --
You can also pick a server on the selectable list. Just guessing --- Melbourne, London, Japan, Hong Kong, Amsterdam might be among those you would like to performance test.
You have a week to smoke test it (they don't even ask for any payment for the trial) --
For those with Snowden concerns -- this one seems to be a US based company that does log. On the plus side, P2P is ok and usage is not measured/ capped (info not found @ Avast -- but consistently found on VPN comparison sites)