First of all, their execution is like waiting in-line at Aldi or Lidl, there will always be a queue... I feel like executing a trade takes forever with these guy's.
I will list my main concerns about Core Spreads and why I think they are a bad choice when it comes to Forex brokers...
1. Execution (as mentioned above)
2. I had a friend that went long. Their platform then froze so he could not place a stop-loss. When the platform re-opened he had lost £10,000! Okay, he was way over-leverage and risking far too much. The concern I wish to raise is not my friend's stupidity (I have tried raising this with him), it is the unreliability of their platform. If it goes down and you are half-way through placing a stop-loss or take profit, it will not be honoured. My friend lost so much and they would not even apologise for the outage, let alone offer him some sort of refund.
3. Their affiliate program is a scam. I use to refer traders to them. They opened live accounts and traded. Some of them a lot. No affiliate payment was ever given to me. On my affiliate account, my account balance is zero... Not a penny.
4. Spreads seem okay but you get stopped-out for no reason. I feel like their spreads either widening drastically in a split second (faster than the human eye) or there are major issues with their trading software. You open a trade, price is 5 pips from your stop (including spread), the spreads don't widen, there is no news, and the position is gone! Like magic! Black magic...
Anyway, you are much better off with other brokers. Not sure why you would ever open an account with a market maker anyway. I think most do this out of ignorance.