Pros: Ergonomic feel.

Cons: First keyboard came with the trackball DOA. took over two months for an RMA replacement. Second keyboard (the RMA replacement) lasted about a month before it's trackball quit working. Third (New) keyboard, the trackball half works, sometimes the optical lift works, sometimes it doesn't. Also the keys have to be pressed several times to register. Over priced Piece of junk. not even worth using if it's free.

Overall Review: Not sure how SIIG is still in business. I've gave them three tries, never again. I sent the last keyboard back to SIIG in pieces.