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I've been developing with NT7 since they started the beta program. It's been painful at times, but I believe it's been worth it, because NT7 allows me to implement ideas that I could only dream about otherwise.
With the caveat that what I'm doing is a bit far out of the mainstream, and my current system's status is trading with an IB paper trading account, not yet with real money, here is what I'm doing with NT7:
I have a pair-trading strategy which trades from a universe of 100 stocks on 1-minute bars (all 100 stocks are in a single strategy: 100 1-minute Bars Objects with data from IQFeed). It creates all possible pairings (4950). Each pairing has 1 DataSeries and 2 BoolSeries associated with it, for a total of almost 15,000 1-minute series with infinite lookback.
Once a day, each pair's history is analyzed via calls to compiled Matlab routines to determine which pairs meet trading criteria.
On a faster basis (currently 5 times per day) entry and exit criteria for each pair are recalculated.
Every minute, each pair is scanned to see if has hit a trade entry or exit point. If multiple pairs want to trade the same symbol, the "best" candidate is selected.
NT7 handles all of this easily. I'll be the first to point out that I have more work to do and I'm not yet trading NT7 with real money. But, I have to say, I'm very pleased with the power, flexibility, and performance of the NT7 platform. I don't know that I could do anything close to this on any other platform accessible to an individual trader.
I started in this business 15 years ago programming strategies for a unix based autotrading system (nearly the dinosaur age) and I haven't touched a backtester in years. There are so many ways that Man beats Machine.
