The 35.. XL is brilliant, compact and light. I use it without centre filter.
The 24mm XL is a fine lens, but I tend to use it for landscapes (I am an architectural photographer) or on a tall tripod in order to avoid unwanted foregrounds (or I crop).
It is not my most used lens, but it is always in my bag. I have also shot it without a centre filter, there is vignetting obviously, but for certain shots (or in B&W) it has a certain look that is not unpleasant.
Together with the SWA, considering its size and weight, it is infinitely kinder on your back than any Hasselblad/Phase alternative.