Most of the traders are victims of slippage problems. Slippage is the difference between the price at which an order is placed and the one at which it is filled. Slippage is important because it is one of the factors forming the transaction costs of your trading, together with spreads, swaps, and commissions. I have been using the swap-free account of the Trade12 broker without facing any technical errors like slippage or dealing desks.