This page is a list of the best ergonomic keyboards. They vary in price and build quality. The Microsoft ones starts at $30, and others starts at $200. The expensive ones all feature mechanical key switch. Mechanical key switch is very good for your hands. 〔➤ Guide to Computer Keyboard Key Switch Mechanisms〕
Microsoft Sculpt Ergonomic Keyboard Review
The Microsoft ones are designed with mass appeal, and cheap. Not radical, and easy on your pocket.
This is another interesting design. It's better than laptop-style keyboards for sure, such as Apple's Aluminum Slab, but worse than real ergonomic keyboards. For one thing, it has shallow flat keys, not good for serious typing.
Full review: TypeMatrix Keyboard Review.
Excellent. Full review at Matias Ergo Pro Keyboard.
Excellent! Full review at the Truly Ergonomic keyboard.
Full review at Kinesis Keyboard Review
Maltron keyboard comes in many different models. It has bowl-shaped version like the Kinesis, and also flat version. Full review at: Maltron Keyboard Review.
This is a excellent keyboard from Japan. See: μTRON Keyboard.
Excellent. See: Ergodox Keyboard Review
See: Keyboard.io Keyboard Model 01 ⌨.
Kinesis ＆ Maltron is about 5cm (2 inches) smaller than standard pc keyboard.
Note: Maltron is the same size as Kinesis. See: Keyboards Size Comparison: Maltron, Kinesis, Microsoft Ergonomic
Taking their price into consideration, the Microsoft 4000 is the most easy buy. It is a mass produced product and made to appeal to the mass population. Quite superb design by its various curves and tilts. However, because it's made for mass appeal, it does not use expensive mechanical key-switch that provides good tactile feedback. It uses cheap key label technology, so the key labels wear off (On my keyboard, the labels M and < are COMPLETELY gone. (because fingernails often hit them)). Its key mechanism (rubber dome) is Very Bad. The Space bar is stiff (one of its most common complaints). It's somewhat loud, makes ugly “clunk”, “thud”, “squeak” sounds.
the Microsoft 4000 is the worst in comparison to others, but the others are about 10 times more expensive.
Which one to chose depends on your needs.
See also: Bad Advices from Programers about Typing ＆ Keyboard (RSI)
Another alternative is 2-Piece Split Keyboards: Kinesis Freestyle, Goldtouch Adjustable. They are usually around $100, but all use rubber dom, with staggered key layout. They are ok, but not best.