Forgot to mention, my Chinese communist flail mower has the heavy hammer flails, not the slicer style flails. If you are cutting rough grass/weeds mixed with some brush, rocks and Buick hubcaps, get the hammer flails. They will tear through most anything up to 3 inch limbs without severe damage, great for cleanup of fallen branches after a storm.
Mine leaves a nice, groomed cut in the grass at the house, not golf course fairway quality but that's OK because I don't play golf and have no plans to take up the game. When I have time to waste, I ride my BMW motorcycle.
As for maintenance, my Chicomm flail mower has only two issues, when new, the grease fittings for the rear roller were oriented incorrectly. It was a 15 minute job to correct that. Also, the top link brackets required repair, a well documented issues with the Chicomm mower from Titan. I am surprised that they have not demanded the manufacturer make a minor design change to fix both of these issues.
As for bearing and seal replacements, these are off the shelf parts, readily available most anywhere. I have spares that cost less than $30.00 for the set. So far, all the rotating stuff has faired well over the 5 years I have used it. Original belts, skids and the gearbox shows no signs of wear. My Chicomm mower was the cheapest available and shipping was free. Purchase at you own risk but, so far, mine has not exploded or had major failure.