I agree. Unfortunately, you can't really have checked 'em out until you've used them for a while... If you're sophisticated when it comes to programming, you might also consider Wealth-Lab for backtesting. ErlangerQuote also has its boosters. Depending on what you're aiming for and willing to put into it
I used to use TS 2000i with an E-Signal datafeed - it worked pretty well, but it was a lot less stable and dependable than TS6 - which is not perfect (though I remain an infamous junkie for TS6, and wouldn't stay home without it...). And, oh yeah, using the Global Server could really be a pain for normal trading activites (though was handy for using 3rd party tick data).
You'll hear different things from different people about all of them: There've been a lot of complaints on this site about Qcharts and IB, but other users have reported no problems. MetaStock's downloader got some very negative reviews when it first came out - I have no idea whether they've fixed the problems. Take opinions from web sites with a grain of salt: It's hard to know for sure what roles were played in a given user's experience by ISP, operating system, trading style, individual creativity or impatience or taste, bad luck of the draw with customer service, bad timing in relation to upgrades or other events, and so on, and so on...
Good luck...