Yes, but I didn't put it in production yet. From what I see it's only useful (to limit slippage and enhance fills) for IB accounts located in Europe (and to trade European instruments) or for brokerages like LMAX.
For CQG it's not 100% clear but the risk management still done in US, so the benefits are not as good as expected, if everything were managed in London.
For all these reasons I won't open something in London quickly, I'll wait to see a localy managed risk at least for CQG London (I've got a lot of CGQ clients, some of them will be interested). I don't want to open a location if it costs me too much, which might be the case today.
If someone wants to validate my thoughts, I have some available and free slots in Paris. It's between London/Switzerland (IB)/Frankfurt, so not the perfect latency for all these places but a good compromise.