I have e-mailed to your query, but let me re-iterate.
I would consider this seriously as seems ok deal, BUT
spend some time with them first ask lot's of questions..
Where are you trading now ? Why are you considering a change
? You have said your volume is quite high, so you must be
trading some place, right ?? My experince changing brokers/
software will seldom be a "cure for all", but clearly
sometimes it may be an advantage. It seems that maybe
they will take some trades from you even if you go thru
the Bloomberg if it's nasdaq they can fade your trade !!!
Even listed they can fade if it's an institution desk.
Ask the these questions. $7 seems very low but are you
trading from home or their office/floor ???
Good luck !