Got a newman cam for my GT recently, and was not happy.
They hadn't machined it correctly and the distributor would not fit. Had to be sent back for some tweaking!!! They didn't seem too surprised or bothered.
They arranged a courier and there and back pretty quickly, but still meant was without my car for more time, and had to pay twice for fitting.
Was gonna use them for a turbo cam later in the year, but having my doubts about it.
On the plus side, its cheap and seems to work really well, has brought my GT to life.