My first post to Elitetrader, so here it goes ;-)
I guess that if you're really in the HFT, than nothing is good enough, or just too expensive. But in algorithmic trading too, you may want the fastest execution after your algo decides to take action.
I'm trading the S&P Futures E-mini from Europe on Interactive Brokers. From Europe, I have a ping time to their gateway of around 130ms. When I'm on a AWS instance in North Virginia, it's down to 35ms. So, if a 100ms matters to your strategy, than this could be a usefull investment.