With J-trader, you can have option of paying $0.50 per side, which perfectly suits small traders.
As example:
250 Round turns x $0.50 per side= 250$ only
With X-trader there is not "$0.50 per side" option, so
will be little costly for low volume traders.
X-trader $650+ $250 Extra Exchange= $900 plateform/monthe
$900 / 250 Round Turns = $1.80 per Side
My Advice to Newbies: IF you aren't doing at least 300
Round turn a monthe, you don't need X-trader.