Just a few thoughts. The price, while high, is in the ballpark of what Canon is going to ask for their new TS's.
Looking at the lens, while it has shift, it looks like it doesn't tilt. For me that's a deal breaker as I use tilt much more than shift. For those who are unfamiliar, here's a brief explanation:
As you all know, the focus of a lens can be thought of as a plane that moves forward and back as you focus. Whatever that plane cuts is in the sharpest focus and as you stop the lens down the effective plane gets thicker so more of the subject is in apparent focus. This is called depth of field. ( I realize I'm being very basic here, I just want to be sure we're all on the same page)
For almost all lenses used on DSLR's the focal plane is 'square' or parallel with the image sensor and can only move in and out. In fact, I'd suspect many photographers think that's the way of the universe. Not so. A tilting lens allows you to tilt the focal plane so, for example, if you have a field of flowers extending from your tripod to the far distance, instead of having to pick a hyperfocal distance, stop down and hope for the best, you can lay the focal plane down onto the field keeping it all sharp. In that case the depth of field plane thickens along the tilt.
In fact, view cameras combine the tilt with another movement called 'swing' which allows you to twist the focal plane pretty much anywhere you'd like which is what gives them their real power as image capturing tools. This is impractical for a DSLR lens design but the simple tilt does cover most of the needs and is why I'm waiting to see how the new Canon 24mm TSE works out.
Ed