I have the 410, the Arca geared not pan, and the Sunway Pro II geared not pan, and a Benro with geared pan.
The Arca is on my tripod. Smoothest action. Light weight. Levers to release geared movements, best solution. I thought the lack of geared pan would be a draw back. Not so much. I do many panos and with the 410 I would do a dry run to determine how much I had to turn the knob to get the correct overlap. Then I would take the pano by just turning the knob that amount for each frame. With a little practice it is pretty accurate. It was very quick, great with fast moving clouds. I found that I did not miss it that much as the panning movement of the Acra and the Sunway is very smooth, damped and easy to place where you want. Just use the third grid lines on the screen and select a convenient object in the subject and pan it to the next grid. I don't think you would have any problem with architecture. Beside leveling to the horizon seems to be the most critical and difficult. Remember to turn off stabilization. If you don't, when you pan to a spot it will drift back and forth before settling down making it difficult to pick your spot.
I use the Sunway on a custom made car window mount since most of my photos are taken from the car as I have difficulty walking. First tried the Benro, its knobs and layout was just not convenient, kept getting in the way. And it was not as smooth operating as the Arca or Sunway (which is close to the Arca). Wanted to keep the Arca on the tripod so I tried the Sunway. Was pleasantly suprised. Smooth, compact and easy to operate. It has fold out handles instead of releasing the gears for rapid movement. I do not use that feature much and find the Sunway solution acceptable. The 410 and Benro use concentric knobs that I find too hard to move and tend to hurt the fingers.
The Arca is the best but at a stiff price. The Sunway is a close second at a fraction of the price.
If you have a tripod with a leveling center column then you won't need a leveling base. If you don't have either consider a leveling base. First thing I do when I set up the tripod is to use the leveling base, it makes things much easier after that. I have tried most of them and by far the best is the Acratech. Small and precise with a big bubble level and not too expensive. Recommended.
I use M4/3 so weight capacities were not a consideration. If you use larger equipment you should check that out.
Larry
