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I would say the gate slider would be harder to setup and the inbuilt controller is overly sensitive to force margins, that is a temporary force against the motor will make the controller think it is sensing a collision and re open, hardly behavior that is desirable in an observatory. This is again depending on how well your roof works.
The 1100 is considerably more powerful, I have used it when automating larger rooves... I have video somewhere... I used it on an obs that is 8 x 4m which splits in the middle and the 2x 1100's drove each half of the roof. I built the roof and rollers etc... so I knew I had a smooth low friction action to work with, despite the weight of the roof. I also set up 2x 1100's on my brothers pool roof, that roof is somewhat larger than the observatory roof.
Like I said previous, for sliders there are other brands that do a far better job for what you want for similar money.
BTW I sell ata products, and have a gate and garage door installation business.
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