I have a Kaiser Slimlite Plano, the medium size I think. Looking at this Reflecta and some images I've seen elsewhere I believe this is an OEM design. Obviously a buyer can have it cosmetically customised, but in all likelihood it's the same inside.
I'm not too impressed with my Kaise. Illumination is from one side only and shows a light gradient. I also seem to have a slightly bad contact in the switch. I flickers occasionally. I'm also not impressed with the brightness and the glossy surface finish is sensitive and a dust magnet.
It is great, though, to look at a whole roll of slide film at once and as such perfect for the OPs use case. My E6 lab puts the film in endless sleeves and cuts it into strips of six (135) or three (120 6x6). So the dust issue is not that important. When I digitise they come out of the sleeve and are quite dustfree.
But for camera digitisation I use a previous generation Kaiser pad. A Slimlite LED. Mine is just big enough to fully iluminate a 4x5 sheet and has a non glossy surface. But they are discontinued. It's running on AAA batteries, while the newer ones have a build in Li-Ion battery.