ive had a kent piper and newman,the newman is far better than any of 3
i never had any issues with my piper wearing down fast,but felt the car felt less powerful lower down in the rev range to get top end power where as my newman has more low down grunt and still more top end than the piper,although mine is custom specced so cant comment on there off the shelf item,also when considerin the newman you have to get he solid lifters which will need adjusting often