i have just ditched e-signal. i trade futures and just couldnt put up with it any more - it started to cost me money in terms of missed opportunity. when it does work, the feed is fast and accurate though. couldnt comment on stocks - most seem to think its ok.
real tick. never used it, but i know people who have and they dont seem that impressed.
im currently using iqfeed (www.iqfeed.net) it seems rock solid so far. for trading us index futures, you are looking at around $80-$90 including exchange feeds, but you also need a chart application like www.sierrachart.com , quotetracker.com, metastock, tradestation etc. the best is probably www.ensignsoftware.com
www.prophetx.com looks very good, and costs around the $200 mark with data i think. you must cotact them to get a quote. its also from the dtn data plant (like the iqfeed) so should be rock solid. i will take a trial next week.
i use ninja-trader as a platform (dom) and they have their
own charts, which includes tick data. my data through
them is sourced from TT ie: the same as XTrader. for
this i pay about $50 per month. currently trading ym futures
through Vcap futures at $3.67 per round turn all in.