OK. I'll be the first to admit it. I am no fitness expert. What I am is a former athletic guy who is now less active. I am new to using a treadmill and used to run outside.......a little. I was VERY pleased with how easy the 9.23 was to assemble. The holes line up perfectly! The instructions were spot on. Words cannot express how happy I was with both the instructions and the tools provided. So, I have been on the treadmill once. I really didn't know what to expect, but I love it! I am actually looking forward to getting home and getting back on it. I am very pleased with this purchase and would highly recommend this treadmill!