Riptides:
I think I answered your first couple of questions in the two replies above. The only tilt adjustment would be whatever you can do with the 3-pt adjustments. I adjust mine to as near level as I can get it, since my wife's round pen is supposed to be level. Other than that, the harrow will work on any slope you feel comfortable with on your tractor. If I rework the round pen this summer, I will probably try to do a better job building a base (probably compacted crusher run) and may add some drainage to carry away excess water, so the area won't get so muddy and slippery in wet weather.
Cowboydoc is correct. There are much better arena groomers available (one from Ram Fence, for instance), however, since I only have a VW budget, I couldn't go for the Rolls /forums/images/graemlins/smile.gif. Also, since my wife and grandkids are probably the only ones that will use the arena and round pen, I couldn't justify a high-priced fancy arena groomer. If we were running a large equestrian facility and having regular horse shows on it, I probably would have gone for the gold-plated variety. For now, the Spyder Rotary Harrow looks like it will do us just fine /forums/images/graemlins/smirk.gif