Was able to fully test the Arcturus Binoviewer on my Orion 150 Mak this evening. The monsoon season seems to be wrapping up here in AZ and the clouds dissipated quickly after sundown. I set the binoviewer up with a pair of 15mm SV Bony wide angle 68* eyepieces (same as Orion Expanse). I used 1/4" pin striping tape to fill the eyepiece undercuts and it worked great - no alignment issues at all. The views of Saturn and Jupiter were spectacular and the moon was almost "scary"! This seems to be an ideal eyepiece for the binoviewer and I read where someone else did the same with a pair of 20mm Expanse clones. Due to the added focal length caused by the binoviewer, I think the overall magnification came out to about 150X which for me is a good compromise for planetary viewing. This worked so well I then set up my 102 SkyWatcher Mak and tried the binoviewer on it and was surprised at how well even this small Mak performed. I tested both scopes on a Twilight 1 alt-az mount. The 150 Mak with binoviewer may be close to the limit of this mount, but using vibration pads on the legs made it very acceptable. I need to do the altitude arm reinforcement mod that I read about here in CN. I spent about 3 hours out and temps were in the mid 80s when I finished and no mosquitoes for a change.