I'm a fan of the Nova vertical processors due to my space limitations. I used to use an 8x10 Nova heated four slot before upgrading to their latest model in 16x20. Last year I was lucky enough to purchase a 98% complete unit for £50. I was able to finish it up myself at home and it's served me well since.
This Optima business is quite interesting. It actually started out as a Kickstarter. Here is a link to the page:
https://www.kickstarter.com/project...ic-darkroom-printandfilm-proces/posts/2430669
I've been following up updates on Imaging Warehouse regarding the new Nova processors, and as of this morning, the website is notes that the new Nova models are due later this year. (Never mind the rolling revised estimates since last year).
Looking at Optima's website, only RK Photo, a UK based photographic supplier, is listed as a retailers for Optima's units. (Though I couldn't find the Optima units on their website at the time of writing.) We'll have to see how this changes in the time to come. I wonder if there will be both Optima and Nova units, or just Optima.
I ended up building my own much smaller unit as a proof of concept for a larger, more complex unit, which I plan to make in the future. Attached is a picture of the little gem. It works a treat for making photographic postcards!