Disliked...the ECN category should really be broken into two sub-categories:
ECN-STP (IB, MBT, Duka, Delta, FXCM AT, all Currenex brokers, etc)
Real ECNs (CME, Hotspot, etc)Ignored
...are you sure that Hotspot does not fall under the 'ECN-STP' category as well?
To my humble knowledge it's only FXall and EBS who fall under the RFQ category whereby printed BIDS and OFFERS are binding and are not Indicative as is the case with your listed 'ECN-STP' Broker's list above.