A:Answer Hello Finney530, thank you for your question and for your interest in model SHXM78Z55N. The following are the differences between the SGX78B55UC and the SHXM78Z55N: 1. SGX78B55UC is ADA-compliant, which means that it has been designed to accommodate customers with special height requirements. 2. The SHXM78Z55N has space for 16 place settings, whereas the SGX78B55UC has space for 15 place settings. 3. SGX78B55UC features a 30-minute Quick Cycle, while SHXM78Z55N offers a 60-minute cycle. In response to your other questions, the SGX78B55UC is still being manufactured. On a daily basis, we are experiencing unprecedented demand, worsening global material shortages, and appliance delays varying from product to product. Wee apologize for the inconvenience caused by the delay and recommend that you stay in direct contact with your dealer regarding your open order, since they will have the most up-to-date information.