The Fujitsu KBPC E is a similar USB keyboard. Quality is adequate -- no mechanical keys etc -- but it's pretty flexible and you can sometimes get new ones for low prices on eBay.

Since the split is adjustable, you can experiment with the separation. That should help you decide whether you want to go for a more dramatic ergonomic model.

http://www.fujitsu.com/fts/products/computing/peripheral/acc...