I've heard reports of their execution getting slightly worse after moving from the PrimeXM MT4 bridge to their own in house MT4 servers. They also mixed in enough non-LMAX liquidity feeds to make execution differ greatly from LMAX's own PrimeXM MT4 bridge.
The change is new, so maybe they'll shore things up..
If anyone has accounts with LMAX directly, and can compare an MT4 account to Armada's new MT4 offering, that would be interesting.