Toper makes excellent equipment. Like most of the coffee roasters in the world, they are hand crafted in Turkey. Even some U.S. roaster companies start with machines that were crafted in Turkey and add their own controls.
By the way, if you have never visited Turkey, it should be a "must see" on your list of places to visit in your lifetime...sooner than later. It is a fabulous country that is very tourist friendly. Rich with history and beauty beyond belief, Turkey (Turkiye) has to be the nicest country I've ever visited. And I've been to a lot of places on this planet. They claim that Iran/Iraq was the "cradle of civilization" - but I'm convinced that the Garden of Eden was in Turkiye! But I digress...
Ozturk has been in business for over 60 years and makes a pretty good roaster. They are located in the city of Izmir (the ancient city of Smyrna), known as the "Pearl of the Aegean". It is one of the most progressive cities in Turkey and, for you Biblical scholars, is on the edge of the ancient city of Ephesus (see Paul's Letter to the Ephesians). Izmir is located on the western coast of Turkey.
I can't compare the quality of Ozturk and Toper, or Ozturk and U.S. roasters, but considering that for the better part of the last 100 years, all coffee roasters began life in Turkey must be worth something. That and the sense of pride that representatives of Toper and Ozturk take in their company and product will give you a genuine understanding of why Turkey is likely to embody the future of the middle east in terms of technology, trade and tourism.
Probably more than you wanted to know about Turkey and roasters, probably not enough about Ozturk. But I suspect if you called their factory directly, you'd find that Ozturk has been supplying roaster "bodies" to U.S. manufacturers for years. It's like GM assembling cars in Mexico, but shipping them to Detroit to install the engine.
I seriously think my next roaster will be an Ozturk, if not a Toper. I only wish I had the forethought to contact them to be a distributor a long time ago!
-BG