I have a Stooge mk 2, which has been adopted by my wife, a Stooge MK3 and recently got a steel Speedball. Have ridden the Speedball around Macc and also Scotland (both last week) and it was great. Good for bumbling, blasting, technical trail riding and commuting.
Very easy to build with no weird tolerances to worry about. Using an Aeffect chainset gives good options for playing with chainline as it is non-boost.
Downsides – it is heavy and the rear clearance is tight with a Knard on a 50mm Halo rim, rebuilt onto a halo 35mm rim and is much better.
It was this or a Krampus – I’ve made the right choice and would buy another (in titanium if I could).