The Very Best Quality
I purchased this to sit in front of new Zeiss Milvus 135mm f/2 and after reading many reviews and watching YouTube un-boxing videos I decided on the Polar Pro and believe me that the quality is unparalleled. My only downside, and I emailed Polar Pro regarding it but really got no answer was that they give you a lovely card about what their App can do but i couldn't find it?
After a lot of searching, i found out that Polar Pro had decided to discontinue the App in 2018 ish, so it's no longer available. So the only thing I drew from this that they have stock in the system that pre dates 2018.
The service from RC Geeks was also unparalleled, fast delivery and packed well, what more can you ask.