I've got a pair of Lister Libertys, can't recommend them enough! Fantastic set of clippers, never had a problem, does several hunter clips on my Welsh Cob each winter. I actually bought them on recommendation from a friend
Dextella, £99.99 off Ebay, "they are Liverymans" same clippers box and tool kit spare blade oil, I have had mine 3 years, don't owe me anything and still working with original blade, may put the spare blade in this year as clipped a friends very thick coated horse last time, my clipping has sometimes taken me 4 hours or more each time as I am a perfectionist, so probably had more use than most.
I love my harmony clippers, my horse is a brat to clip (putting it mildly) yet I can clip him by myself with these with very few tantrums. They are super quiet, really light (and can use with the battery pack so no cables to get in the way) and inexpensive too!
Another vote for Lister Liberty, I am well known for tidying my cob up in the field (he's ace to clip) and they cope really well with full clips on him and my TB