I never got on with my Heinigers
I have Liveryman Black Beauty which I use with a battery pack but can also run off the mains
not having the battery in the handset makes them lighter to hold and the battery just goes in my pocket or clips on your waistband. they have variable speed so good for ticklish or nervous horses. one charge does 3 clips for me.
I have liveryman clippers with the red squiggle on the back. They are cordless and really quiet. I bought some wider blades which makes the clip smoother and quicker and they stay charged for quite long enough for my purposes.
I have Liveryman Harmony Plus which, with the battery pack, can do a full clip and hog when she isn't in her full winter woolies.
Once she's exploded into full fluff, I use Masterclip Roamers.
I prefer the Harmony because they're about as close to silent as you can get, and much easier for getting into the corners. However, the Masterclip are far more powerful. In an ideal world, I'd be able to switch between the two on a single clip but, of course, they don't have the same length blades available. Argh!