I junked the original focus screen and bought a Maxwell Hi-Lux which is wonderful.
The only trick to using the tilt is it doesn't work at infinity. You have to rack the focus out a bit but you'll find you don't need very much tilt. Then I focus to the midpoint of near and far, or thereabouts and use the depth of field preview to pick my aperture.
For many types of landscape shots I find I'm able to gain 2-3 stops vs just stopping down to get the necessary DoF. Which is great if there's a breeze and also puts the f/stop of the lens to around f/8 - its sweet spot.
I absolutely LOVE my SL66E...
But I am strange - I have three lenses (50-80-150mm) for it, but rarely use them....
In stead I love the fact, that I can fit really old "crappy" lenses on it, due to the bellows.
A small petzval stuck in a cardboard, and fixed on the camera with duct tape....
Or a small landscape meniscus type lens...
Not many Mf cameras can accept those lenses so easily..
attached three images:
First a landscape lens
Second a petzval..
How the landscape meniscus lens contraption looks....
pick a Rollei High*D-Screen from the later 6008 or Hy6 if you should ever have the chance. I also found my old screen to be a pain, but shot a like new D*Screen on Ebay some years ago. It does also fit the SL66 and is amazingly bright.
By the way, can someone lend me 18.000 bucks? :-D I started to doubt that this lens does exist at all, but here it is: