Summary: Just received this as a replacement for a similarly prices Targus Compact keyboard that had been returned due to a key layout issue. On opening the box the first impression was good - the keyboard has a standard key layout which is exactly what I was after and it takes up a minimal amount of space. It also doesn't have some normal keys doubling as the numpad like the Targus, which saves having to turn off numlock every time before I'm able to log in.
Summary: Purchased this to replace a normal Logitech keyboard to save desk space. A bit disappointed at the product as the price is not visibly cheaper than similar compact keyboards by other manufacturer but the quality is subpar. The keys are not bouncy at all. The quality of the plastic used is poor. However it gets delivered promptly by the seller, and I assume it does suffice the basic requirements as a keyboard - it types o.k.
Summary: If your right shoulder is hurting is may be because you are holding your arm out to the side because of a long keyboard with a numeric keypad. This is a nice keyboard (not cheap in quality despite the price) and paired with a dollar store calculator it does the business.