For retail traders, with the right software to control their Order Entry, the Dukascopy Swiss Forex Marketplace is the Best Scalping environment available anywhere !
First of all, by using the JForex API it is possible to submit orders very quickly and precisely.
By using the Order Type "PLACE_BID" or "PLACE_OFFER" a very significant Price Improvement can be realized (subject to liquidity), and the orders are LIVE on the ECN, instead of converting to Retail when a condition is met, as with a normal Limit order.
I have constantly been amazed that I can (sometimes) buy the BID, even when I place my order at the ASK price. Price improvement on the transparent and fair ECN, even for Small Lot Sizes down to "micro lots" is just the Best a Trader could ever want 
The industry leading abiilty to Merge smaller positions into an equivalent larger position allow Scalpers to "stagger" their Entries to the market so that they are able to achieve a Better Average Price.
Personally I have worked for years on the concepts of Incremental Micro Scalping, and it is clear to me, after working with Dukascopy for over a year now, that this is the Best Retail Forex brokerage available anywhere.
There are many reasons to choose Dukascopy, and I'll perhaps get into some of those in future Blog posts.
I am always happy to assist struggling traders (we ALL struggle, right?) to find a more successful Strategy
HyperScalper