Assuming you already have an IB account, just load up MBT's homepage (as it shows the live spreads) and compare yourself. No need to rely on 3rd party opinions for something that fluctuates by the second.Quote from 4XQs:
TraderKGB said that MBT's ECN has spreads comparable to IB. I'd be interested if anyone can offer a closer comparison as I've completely neglected looking at MBT as a potential partner. My experience is that noone beats IB.