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
Manufacturer	Perixx(ペリックス)
Series	PERIBOARD-512BUS
Product Dimensions	48.06 x 23.37 x 4.37 cm; 1.03 kg
Batteries	1 Unknown batteries required.
Item model number	11525
Is Discontinued By Manufacturer	No
Color	Black
Item dimensions W x H	48.1 x 23.4 x 4.4 cm
Voltage	4.25 Volts (DC)
Operating System	Windows
Are Batteries Included	No
Item Weight	1.03 Kilograms

Perixx(ペリックス) PERIBOARD-512BUS エルゴノミクス キーボード 有線 英語配列 フルサイズ 左右分離型 人間工学 104キー 立体カーブ 腱鞘炎防止 【正規保証品】(有線・ブラック)

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Perixx(ペリックス) PERIBOARD-512BUS エルゴノミクスキーボード有線英語配列フルサイズ左右分離型人間工学 104キー立体カーブ腱鞘炎防止【正規保証品】(有線・ブラック)