I own a Hotplate and have owned a Weber Mass. For my purposes, the Hotplate sounded a lot more natural with my amps (Fuchs Blackjack21, Dr Z 6545). I wish I would have had the chance to try the Hotplate with the Tweed Twin Reissue I used to own because I did not care for the Mass with it. The Mass does have some nice extra features the Hotplate doesn't though, like switchable impedence, tone stack, etc.