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I use sierra charts and they have excellent replay functionality, I guess thats more useful for a 'manual' sort of backtest. If your talking algo strategies I'm not sure how good Sierra would be as I've never experimented in that area myself...
NT 8 is an upgrade to NT7 however the backtesting was much better in 7 than in 8....don't know why....the simplest of programs are tougher to program and run in 8....I don't think they spent a lot of time on it...either that or I just haven't figured it out yet....7 was simple.
The strategy builder wizard in NT8 is much better than NT7.
Regarding comments by @loantelligence about NT8 being inferior to NT7, NinjaTrader changed a lot of the programming objects / APIs when they moved to NT8, so lots of NT7 code won't run in NT8, has to be converted. It was a pain but overall the newer APIs are better. But some of the changes in NT8, regarding backtesting, I do not like either, and the software tends to lockup more frequently, or I have problems getting all of the data I need in the backtest sometimes.
Sorry I didnt say NT8 was inferior to NT7....the backtesting is much better in 7 than in 8.....Granted Strategy Analyzer is more powerful....but its more difficult to work with....quite often not sure what NT8 is trying to tell me....writing a simple compare current bar(0) to previous(1) bar worked in both 7 and 8 but when i wanted to compare previous(1) to previous(2)...7 no problem 8 tells me Ive got a duplicate instruction....duh.....I dont....but it ignores the bar back portion of the instruction......created a strategy and ran it got results.......then come back later....same strategy....doesnt run.....no results....so i am finding much difficulty in working with 8......and this is just the simple stuff....