I use the Alnico Cream in a '67 Deluxe Reverb, the original speaker was gone long time ago when I bought the amp.
Compared to the Alnico Gold the Cream has a tighter low end to my ears and roughly the same mids & high end. I've tried about a dozen speakers in this amp, JBL, Jensens, various Celestions - after almost 20 years with the Deluxe I think the Cream and the Gold are my favourites.
Pros: Very nice sound and louder/more sensitive than a lot of other speakers reducing the need for a more powerful amp.
Cons: A bigger magnet equals more weight, not a biggie though.
Might need a bit of breaking in - as most replacement speakers.
Maybe a bit pricey - but worth it IMO.