I believe that the HM-5 is a decent motor, especially for diesel remotors. based on the information i’ve seen, they are good runners and are most commonly used in KATO’s hood diesels; though I don’t know much more than that because I dont run any. I do know that they are reccomended for most jobs, so I assume its used a lot.
I only have one Kato, but its one of the smoothest running engines I have.
I see similar findings with other club members.
I asked about the HM 5 earlier in the thread and its a gauranteed version, no 12v or 24v to worry about 
I’ve switched my thinking now and am going with an EN-22 12V motor. It has a better torque rating and runs faster. This will allow my locomotive to hual frieght much better and be able to have better slow speed performance because of the 5-pole motor. Thank you for all the help on the locomotive. I will try to get a video of it running posted. I will also post pictures of the remotor for those who also need assistance in remotoring a big boy.
Thanks Much!