The first thing critics noticed was the improved fit and finish of the series, including an aluminum surface that PC Mag says "makes for a noticeably sturdier, firmer feel beneath your fingers." TechRadar was so impressed with the change they feel "confident" that if they dropped it 10 feet the 4 Professional would still work without issue. Other design changes Metadot made include not just a volume rocker, but also dedicated media keys for controlling music, which TechSpot says is a "nice addition." The underside of the keyboard is a bit odd, though -- gone are the traditional flip out feet in favor of a magnetic strip that doubles as a ruler. Yes, that's right, the bottom of this $169 keyboard is a magnetic ruler. "Admittedly," says HotHardware, it has "come in handy," so don't write it off just yet.
Metadot offers two key type options for the 4 Professional: the quieter MX Brown, or the more clacky MX Blue. While the Blue switches are loud, TweakTown says "it does not take long" to adjust to the noise, and typing on them is "smooth sailing." TechRadar says the "satisfying" click makes the 4 Professional "a dream to type on," and TechSpot finds the click to be "reassuring" as it "motivates" them to "type quicker." Compared to the older Das Keyboard II, PC Mag finds the typing experience on the 4 Professional to be "every bit the joy."
The Das Keyboard 4 Professional shows that Metadot is still serious about offering the best mechanical keyboard they can. It's aluminum body and enjoyable experience helps instill typing confidence in any writer or active typist, but the lack of customizable keys and macros is a let down, meaning serious gamers might want to look elsewhere. For those who just need to type, the Das Keyboard 4 Professional should be high on the list of options.