For the price, the NT5's are pretty much as good as you're going to get. I was debating between paired NT5's and an NT4. It's probably going to sound strange to some of you, but I really needed the versatility of the NT4. Yeah; a fixed 90*XY is "versatile" where I come from and it's fair to say that I'm quite fond of my NT4.
I've done location recording (amplified concerts, interviews, environmental sounds) with it paired to a Sony MZR700. I've had nothing but good results from the microphone itself. The MZR700, on the other hand, has seen better days (dropouts, disc errors - cleaning doesn't help). So I'm currently shopping for a solid-state recorder. But that's a story for another thread.
The NT4 (and, one would presume, the NT5) is a giant leap up (in both quality and price) from the Sony MS907 I had been using. I've used the NT4 at home to record band rehearsals, self-released recordings, and group discussions. It's mono-compatible, which comes in handy for recording vocals (or you can leave them in stereo). I've even thought about shockmounting it to the ceiling of the rehearsal space (to keep it in one place) and then moving equipment in and out of the space to multitrack (also another thread - maybe another board - definitely worth trying). The NT4 is the Swiss Army Knife of microphones, as far as I'm concerned.
The only problem I've had with it is finding a decent outdoor windscreen for it. Dead kitten?