I believe TradeStation does as well, although then you'd have to put up with their platform's... um... amazing relability/stability.
no retail broker does. period. if you need unfiltered data you need access to special exchange gateways that only a few clearing members have the demand to justify the cost of distribution of this data. if a broker was to broadcast every tick (price/volume change), your eye wouldnt see it as the human eye can only recognise something like 6 changes a second max. so does it matter? however, as for your question, everyone will throttle prices unless you are co-located. pats (j-trader) have the most reliable price feed over the internet/distance assuming the provider invests in infrastructure.
A few of my associates have recently closed their accounts with Tradestation. They're a joke for daytrading futures. Too many problems to list.
I think out of your 5 posts so far, about 3 of them are bashing TS, that is not too 'professional' is it? Most traders will not rely on one datafeed/one broker. Get alternative feeds such as Zenfire, OECry, Infinity, Esignal etc if you are trading futures. Here is a good list mainly for stocks: http://www.quotetracker.com/qsources.shtml Find one that "sucks" the least.