enrick71,
In-depth product reviews and comparisons of the type commonly found for computer hardware products, for example, just don't exist for data feeds and trading software. I don't know of any trading product review sites. You might find some reviews done by trader magazines, but those are actually product promotion pieces that the product vendor pays for, so they're not unbiased, not likely to mention negatives, and they're usually not very detailed. Your best bet is to post specific questions here and request feedback from product users.
Personally, I recommend eSignal. The data feed is extremely reliable, and the data subscription options are extensive. There are also a lot of trading applications that use the eSignal feed, so you have a lot of versatility as to other tools that you can use with eSignal data.
eSignal's software platform has undergone a huge change in the last year, and now offers charting that supports EFS (eSignal Formula Script), which is Javascript with eSignal functions. You can create formulas to display data, alerts on analytic study conditions, etc., in about any way you can imagine, and you can even automatically trade your system using EFS. There's a whole community built around creating, tweaking, and sharing EFS files at eSignal's File Sharing and Bulletin Board websites. These improvements are huge, and RealTick by comparison is in the stone age.
Another huge positive for eSignal is the progressive attitude and genuine interest in product improvement expressed by eSignal management and staff.