I’ve got two ‘anglesets’, neither Cane Creek, one is a Works Components -1? on a standard headtube, works nicely, fitted fine with a head-set press, lined up with a mix of a steel rule and some thread. Works fine, nicely made, massively cheaper than a Cane Creek one.
The other is a custom-made one from a guy called Saar who posts on mtbr and CNCs them to order, it’s a -2? one in a zero-stack, 41mm internal diameter headtube. Again a little fiddly to install, but has completely changed the character of the bike, a Pace RC405.
One degree change is detectable, 2? is quite a big difference. It’s a much neater solution than just sticking on longer forks because the seat tube is actually steepened and the BB drops a little too, so you end up with a bike that still has decent weight distribution and climbs properly.
On my Pace, the bike’s designed to work with 130mm forks, is okay as standard with 140mm Pikes, but with a 150mm Revelation the front end was awful on climbs. With the -2? headset, I’m able to run a 150mm Sektor and still keep the front end low and climbable. And it’s so much more together and stable on steep descents and downhill generally.
Brilliant upgrade if you know what you’re trying to achieve, Works Components stuff works great and is loads cheaper than Cane Creek, though as above, a little fiddly to install. Saar reckons there’s a +/- 2mm tolerance on alignment fwiw, but it makes sense to get it as close to perfect as possible.