The main reason i want to go via this proxy is that i have one central web interface (the stratum-proxy has a decent one) under my control where i can tell Lee Team once to point my miners to the proxy as first pool and change all pool priorities, worker settings and more myself after that. It's really a win-win.
mxnsch,
if your proxy is outside of China you'll end up against the Great Firewall of China and your miners will not be able to reach it (stably at least).
So you'll need to have a pool inside China at least as a backup.
I'm mining with Lee since the beginning of 2014 and in the end I was forced to use Chinese pools to have reliable mining (I was using Slush's proxy running in a datacenter in Europe).
Regards.
spiccioli