Tim,
my comments would be the same as Peter’s. I have a C14 and I find the lack of access to the zenith and it’s vicinity rather a problem and interferes with time series exposures. I would also appreciate a larger aperture . I don’t know what present models are like, but I would hope the access to the zenith would have improved. My dome is manually operated and being some years old and ex-demo the newer automated system does not work with it.
Good luck,
Eric