I've never played through an Ampeg 810 , but the rehearsal room we use in Ipswich , has an Eden 810 XLT (a quite rare and discontinued cab) , all driven by an old Ampeg V4B .
Absolutely superb .
Guy is selling up , and keeps asking if I want to buy it . He he . If it was 610 XLT I'd be all over it , but the 810 is just that bit too impractical