I have a set of Wahl Stablemate clippers (they are much smaller than the conventional size) and they are very quiet. I only did my own horse once or twice a year, so they weren't overworked, but they did a good job, even if it took a bit longer as each stripe was narrower, and never caused me any problems.
I have the Avalon ones aswell with the ceramic blades. I do a tidy up with medium blades after taking the bulk off...my girl is now as soft as a baby's bum...