Coming from someone who shears many sheep, as well as clipping a few cows...
I have done much complaining about Premeier clippers on here in the past... In short they are wimpy and junk, and I hate my pair...- only good for washed, clean, combed hair/wool...
I love my andis.... couldn't say a bad thing about them, other than they are a tad heavy for some people... Talk about pure power.
I was talking to a Wahl salesman at NAILE this year, and they have a newer pair of clippers, forgot the name,, they are blue-- that worked real nice for me... Are coming out with a new set of multi head ones with the same motor within the next year... I am going to buy them..
if you would like more info, pm me.... I shear 600 plus sheep a year- and can tell you the ins and outs of sheep heads.... I always have 2 sets of Andis, and 2 sets of osters with me at all times, as well as my premeirs.... that haven't ever been used much..