Operational quirks aside, the real challenge for you is getting the most out of it; it is a very expensive optic, for what it is. Mastering it is not impossible, but it will take time. Read up on the Scheimpflug Principle and be prepared for a bit of frustration, because the smaller format means much smaller movements are required to introduce the correct amount of effect (with lots of focus/refocus, checking, rechecking of DoF etc.). I bought my (Mk I) TSE-24mm in 1997 and it took 5 years of intensive use and research to bring the effects to fruition. All TS-E lenses according to Canon are in a specialist area; they certainly don't sell millions of them like so many other L-series optics.
Harold Merklinger published an excellent 4-part reference on the Scheimpflug Principle in Shutterbug, November 1992. Some of the reading and technique is very deep, and certainly there are simpler ways (practical ways) of understanding what the lens is doing. Canon's own publication, long out of print, is "The Impossible Picture", published in the Netherlands in 1994 with excellent pictorial diagrams illustrating the affect of introducing movements, along with elementary mathematical conversions for arriving at the right degree of tilt.
Be aware that the use of shift (only) will introduce exposure errors unless you meter first, lock in the reading, then apply shift.