I knew I wanted to try a Fender Rumble, but was debating what wattage to get. In the end I said, heck, why not go all the way. And boy, this amp has POWER. I have to play at 5-10% MAX during band practice, otherwise it starts ripping everyone's eardrums apart. Plus or minus? You decide.
Apart from that, the amp is extremely light, which is an enormous plus. You can sit on it, stand on it and it still feels very durable. The 4 band equalizer and overdrive give vast opporunities for you bass playing to tinker with the sound, as well as the sound colouring (vintage, contour, bright) do make a difference.
Just wanna play at home and not tear down your walls with these 500W of pure BASS POWER? Just neatly plug in your headphones and no one will ever know you jammed the whole night through.
So apart from the effort you have to put in taming this beast during band sessions, I have no negatives. Certainly recommended.