I'm with Cusco and IO540 on this one.
The overhead join is for the twirly tash brigade flying slow non-radio aircraft using their monocled mark one eyeballs.
Too many aircraft in the same place at the same time can easily result and the US system of joining downwind on the 45 wins hands down as it is NOT open to misinterpretation and also allows for safe overtaking so people have less incentive to lie about their position (as IO experienced).
Aircraft are now too quick for this, having to lose 2000ft in the confines of the circuit can be difficult for those of us who fly aircraft with half decent aerodynamic qualities. The added dimension of having to descend deadside during the OHJ makes it less easy to see and you less visible to others - much easier if everyone arrives at the same height.
The OHJ is hazardous and should be scrapped.
SB