So I answered my own question on this. I just purchased the Phone Skope Carbon Fiber case.
Pros over Ollin:
- the footprint on the spotting scope is much smaller. I have a Swaro STS 80 and it is a small piece that attaches and allows the OEM lens cover to fit.
- similar to the smaller footprint, the lens attachment does not affect eye placement whereas the Ollin requires you to have massive orbital sockets or to adjust how close you are to the eyepiece.
- the case can stay on your phone while the piece is an attachment that can mount to the phone and slide, so that (1) you can take it off while not having to remove the entire case and (2) you can slide it in the event on the iPhone you want to utilize the optical zoom camera.
- Magnet free on the Spotter. If you are doing land nav with a spotter (rarely for me, but enough to pique my concern), then this system only requires you to put away the phone to utilize a compass or certain binos—in my case, the Swaro EL RF TA binos, which are overly sensitive to magnets. With this system I simply put the phone down, but close enough to retain Bluetooth connection. I don't have to walk away or put away the spotter.
Cons over Ollin:
- Although it mounts direct and you don't have to slide it around like the magview case, it does require you to lock it in place, which can disrupt where you're looking at. Whereas with the Ollin, I can just set the phone on without having to twist and possibly disrupt what's in the spotter by shaking the spotter.
- the Ollin case itself is a little more sleek and attractive (minus the permanent eyepiece fixture covering 2/3 of the camera lenses).
I will likely go back to a plastic Phone Skope case that can wrap around the Otterbox, but overall I think this system is a touch above the Ollin in features. I wish the eyepiece attachment was a little smoother to attach. If I wasn't using TA on the Swaros, I'd likely stick to the Ollin and deal with the annoying case swap during glassing sessions. I never use the phones digital focus, so the ability to move the eyepiece opening to a digital zoom lens isn't much to me.