Fan controllers are a godsend in these days of high heat hardware and multiple cooling fans. They allow us to have the perfect blend between cooling performance and noise, whilst still providing the ability to move towards either end of the quiet/performance spectrum as your usage changes from browsing to gaming or similar variations in programs.
So what about the NZXT Sentry 2? It's difficult to sum it up without being overly brief. It's great. It does, to borrow a phrase, exactly what it says on the box.
The screen is big, clear, responsive and easy to use. Nothing about it is fiddly or difficult. It controls the fans well and has enough range to tame even the loudest systems. Assuming you aren't running 5 Deltas, obviously. The ability to turn them off completely is a boon and a feature always welcome.
The alarm works exactly as it should, and it is good to see NZXT including both temperature and dead-fan alarms, both of them making a different noise for instant recognition.
Slightly disappointing is the cable lengths included. It's been a long time since cases were the tiny beige boxes of old, but sadly companies still give the barest minimum of cable length. Normally it's to be expected, but a 5 channel fan controller would mainly be useful for the largest cases, ATCS840, Temjin, 800D etc, and NZXT must know this so why they don't give you an extra foot of cable is a strange choice. Still, the cables are long enough to reach the fans, just not to tidy them away from view.
Whilst the cabling is disappointing, the only truly bad thing about it is hideously bad, and that is the documentation. To not provide details on how to work the touchscreen is an unbelievable oversight. The documentation available on their website is a single page PDF and shows everything you could ever need to know. Why this couldn't be included is a mystery best known to NZXT themselves and it is those oversights that can stop a company totally dominating the market.
The only black mark against an otherwise excellently packaged product is the manual, but it only takes a quick read over the on-site PDF to grasp it, and that's only for the esoteric features. It's so well laid out that you can use the main functions just by prodding about, something we all tend to do anyway.
The Sentry 2 is a sufficiently great product, and easy to use, that it is the simplest thing to recommend. If you need a fan controller, don't mind popping their website to see how to use it, and want to move away from the simplicity of a dial, the Sentry 2 comes highly recommended.