zt amp

My friend is looking for a new amp since the one he has conked out on him. He was pretty disappointed since he has only been using it for over a year. He's looking at the zt amp as one of his options. Have you tried it out? Do you have other good amps that you can recommend, one that you have used already and can vouch for its performance? There's a lot of brands and models to choose from so I can understand my friend's dilemma. I hope he gets to choose the right one for him, one which is of good quality and fits his budget.