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These iOptrons are definitely a Rumak design. They were reviewed by Dennis di Cicco in the Nov 2011 Aust Sky & Telescope, and to quote the reviewer "The scope is a Rumak design, meaning that the secondary mirror is a separate optical element glued to the inside of the strongly curved Maksutov corrector ...."
They have three sets of collimation push-pull screws sealed under dust plugs at the rear of the primary mirror and come with a dual speed focuser that has an internal pre-load that prevents any "mirror shift" that can occur with the SW versions.
They are very rugged - I accidently dropped mine (onto soft lawn) and there was no damage or change in collimation.
Haven't heard of or experienced any secondary mirror "slippage". They do get a good report/review in Aust S&T and also in Astronomy Now back in 2010.
Under-rated in my opinion......
Buck (Paul)
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