Recently bought a BB-2000 and could not be more pleased. I've used many bidets over the years. This one, for me, is by far the best.
The truly important features, in my view, are hot water, a continuous (unending) stream of hot water, and water pressure. Some of the really inexpensive cold water seats offer great pressure but cold water is unpleasant and doesn't clean well. Once one moves into more expensive seats that offer hot water, pressure becomes an issue.
The BB-1000 offers the highest water pressure of any seat but the water lasts only about 30 seconds. That would probably be fine in a warmer climate. Where I live, the winters are cold so unlimited hot water was important. The BB-2000 isn't far behind the 1000 in terms of water pressure and you can run it hot for as long as needed.
The BB-2000 gets me really clean really fast. Faster than any other seat I've used (across many years with bidet seats). For the last six years I've had a Brondell Swash 1000, which was a decent choice, but nowhere close to the BB-2000 because Brondell's maximum water pressure is just barely adequate (for me, YMMV of course).
With my old seat, it took about two minutes to get clean. With this one, I can do it in less than one. Thirty seconds if I use the enema wash not for constipation but for cleaning. On that setting, I hold my muscles tight so water doesn't get in. Then I switch to the regular rear wash on highest setting and relax. The result surprised me because it far exceeded my expectations. I've not yet used the enema wash as an enema but I'm glad to have it, both for cleaning as described, and for those occasions when needed for constipation.
As for other features of these seats, to me they're mostly just bells and whistles. My wife doesn't use the bidet features at all but she loves having a heated seat. In the winter months, I'm glad to have it too. Of course, all of the models at this price point share that feature.
Beyond that, I occasionally used the deodorizer on my last seat so I'm sure I'll occasionally use this one too, though without it one can just run the bathroom exhaust fan. I never use the air dryer. The night light is cute but not important; however, I much prefer this one to those that light up the inside of the bowl. The remote control is nice but not important. This one, though not intuitive, is easy to learn and soon becomes second nature. The water stream can be adjusted in all the appropriate ways and made to oscillate. I like having an energy saving feature.
Beyond the seat itself, Bio Bidet deserves accolades for their customer service. It's been astounding. Really easy to speak with a live person. The reps are kind and knowledgeable. If a problem arises, they resolve it without hassle. Brondell was adequate in that department but nothing like this. I've used many other bidets but haven't interacted with customer service, but no company could be better than Bio Bidet. I hope they maintain that level of service through the years. If they do, I'll be their customer for life.