Nice colors and textures in your photo. I've evaluated this and the 24mm from CPS but can't decide which one to buy. The 17 + 1.4x III becomes a 24 with minimal IQ loss stopped down, but the 24 lets you use filters far more easily. Polarizers are pretty handy for windows and landscapes, but 17 is wider.
Anyways, even after two weeks with each, I agree, they are tough to use, particularly Tilt if you're using it to correct vs. artistically. Shift is easier, but the camera must be perfectly level on all 3 axes.
Congrats on the purchase and I look forward to seeing more work on this thread.