I currently use the Dygma Raise and am waiting for delivery of a Raise 2 later this year. If you're looking for a columnar split, the Dygma Defy might be more your style.

Take a look at the Dygma keyboards.

I'm using a Dygma Raise split keyboard with Dvorak as my main layer. The thumb clusters are great for putting difficult to reach keys in more comfortable positions. Second layer has NumPad, Directionals and Functions. Still trying to decide how to make the best use of my other layers.