so i understand from reviews the in-focus indicator will be working with this lens. is this also true when shifted or do you better work with liveview? i am currently using a 5dIII.I only focus my TS-E 17 and 24 via LiveView at 5x and 10x. This is the case whether I am using the tilt, shift, both, or neither.
The viewfinder focus points work for focus-confirm (i.e. they beep as you move the focus manually), but usually they are only reliable when the lens is not tilted or shifted.
Similarly, the camera exposure metering becomes unpredictable (well, probably not, but I've still not figured out how to predict it...), so live-view and/or exposure bracketing are often important.
FWIW, using a tilt-shift lens is a lot more time consuming than any conventional lens. As others have pointed out, you can correct perspective for conventional images, albeit with a loss of resolution.
If your subject is not moving and you don't mind a ton of time in photoshop etc you can pretty much eliminate the need for TS if, for example. you shoot a high-res panorama before applying software corrections (thereby offsetting the resolution loss), or using focus stacking to increase DOF. Unless you shoot a lot of images that would benefit from TS, these might be viable options. I have actually done this for some images shot at 200mm, though it is pain to process.