One of the best sounding open back cabs you'll find, sounds amazing with the EL84 amps if you want to add a bit chime and sweetness to the top end.

Sounds killer with an EZG-50 as well 

"Generally found under a Stang Ray or RXES head, the Dr Z open back 2x12 delivers excellent performance for any application. The 2x12 open back uses lens technology and comes with your choice of available Celestion speakers (see dealer). These are a perfect match for a Dr Z 2x12 combo to create your own unique stack."