I bought the C12Q for my `67 Deluxe Reverb because I've never heard it with what was supposed to be the original speaker.
I think that soundwise it might come close to the originals(?) but for my taste it lacks a bit of low end and (at least while new) sounds a bit screechy in the top end.
I´ll probably go back to the Celestion Gold.
In the end it´s just a matter of taste, I'd recommend try before buying though which goes for all speaker elements.
Edit: I built a 5E3 Deluxe a while back, after trying a bunch of other speakers in it I reminded myself that I had a C12Q too, I put it in the cab and I think this is THE speaker for the tweed style deluxes, i.e. no circuit tweaking necessary IMO. Possibly an AlNiCo speaker might be an even better match for these amps.
This made me give a couple stars more.