How does this compare to the microsoft ergonomic 4000 keyboard? i’ve been using the ms4000 for years on my imacs, but ms has not updated the driver.

I actually use the MS 4000 at home; I bought the Perixx for a friend. However, I’ve used it when visiting, and I find the main keyboards virtually identical: the touch is just a little different, but I had no problem with it. The one real difference is in the arrangement of the arrow keys and the block of six keys including Insert, Home, etc.: the former are arranged in a diamond, and the latter in a 3x2 block instead of a 2×3 block. That did take a little getting used to, but I was adapting pretty well even after a short visit.

Is this a mechanical keyboard? What kind of switch does it uses?

This keyboard uses a rubber dome switch. See my review for full details, but, it has a GREAT snappy tactile feel to it with virtually no clackiness at all. The best way I can describe it is to compare it to a light touch, quiet buckling spring keyboard (think IBM Model M or the newer Unicomp versions). The Cherry MX switches, blue or brown do NOT provide the same sort of feel this board does and I'd take this over mx blue/brown or buckling spring any day of the week. I've had those boards and choose this one due to the key feel and of course the superior split layout. The comfort cannot be beat.

Any know if this keyboard works with a mac, such as a macbook pro? my old microsoft 4000 ergonomic no longer keeps up its software & soon won't work.

Yes, I use it in a Macbook Pro with High Sierra at work.

Is this a soft touch keyboard, meaning nonstiff keys, they push well with gentle strokes?

I find that if I don't press hard, I lose keystrokes. I've had the keyboard for a couple of weeks. Before that I had a Logitech cordless comfort duo and this was the closest thing I could find to that but this is a little bit less sensitive than that one was and frankly I find it frustrating. Both had "real" keys not chicklet keys like a laptop. I'm hoping and expecting to get used to it but for now I'm considering my options because I drop a lot of letters that I didn't with the logitech. Unfortunately they don't make the logitech one anymore and logitech has gone all in on the wave keyboard, which while nice, is less ergo than the cordless comfort.

Brand	Perixx
Model	11354
Product Dimensions	48.49 x 23.6 x 4.39 cm; 1 kg
Item model number	11354
Operating System	Mac,Mac Os,Windows 10,Windows Operating
Hardware Interface	Bluetooth, Radio Frequency
Compatible Devices	Laptop
Special Features	Ergonomic
Voltage	4.25 Volts (DC)
Power Source	Battery Powered
Batteries Included	No
Batteries Required	No
Wireless Type	Bluetooth, 2.4 GHz Radio Frequency
Keyboard Description	Ergonomic
Connector Type	Bluetooth
Hand Orientation	Ambidextrous
Does it contain liquid?	No
Has Auto Focus	No
Programmable Buttons	No
Item Weight	1 kg

PERIBOARD-612B Wireless Ergonomic Split Keyboard – Dual Mode Bluetooth & 2.4GHz with Palm Rest – Compatible with Windows and Mac OS – Black, US English Layout

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